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  1. 8 Archives of Thermodynamics
  2. 8 Chemical Engineering and Equipment
  3. 8 Inżynieria i Aparatura Chemiczna
  4. 5 Refrigeration & Air-Conditioning Engineering
  5. 5 Technika Chłodnicza i Klimatyzacyjna
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  1. 7 Witczak S.
  2. 6 Orman Łukasz J.
  3. 6 Orzechowski T.
  4. 5 Radek Norbert
  5. 4 Honus Stanislav
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  1. 1 2025
  2. 4 2024
  3. 4 2023
  4. 6 2020
  5. 3 2018
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1
Content available Comparative analysis of boiling heat transfer on surfaces modified with thermal and mechanical techniques
Orman Łukasz J., Radek Norbert, Honus Stanislav, Pietraszek Jacek
Production Engineering Archives
|
2025
|
Vol. 31, Iss. 3
401--409
EN
Microstructural coatings enable large heat fluxes to be exchanged during nucleate boiling at small temperature differences. Such heat exchangers are highly efficient and can be used in various mechanical systems. The production techniques of selected types of microstructures (meshes, micro-fins, and longitudinal fins) are presented in the paper, with the main focus on the comparison of thermal performance of these heat-enhancing coatings during nucleate boiling of distilled water and ethyl alcohol. The comparison was done for the same structure height of ca. 0.90. The results indicate that generally, the highest performance was obtained with the laser-processed surface. The heat flux was even about 2.4 times higher for this type of structure than for the micro-fin surface. A modification to the selected model of boiling heat transfer on microstructural coatings was proposed and verified against the experimental data.
2
Content available Determination methods of boiling heat flux
Orman Łukasz J., Kapjor Andrej
Structure and Environment
|
2024
|
Vol. 16, no. 1
1--5
EN
Boiling is a phase-change phenomenon, which is of significant practical application potential due to large heat flux values exchanged in the process. The paper provides an overview of calculation methods that enable to determine the values of pool boiling heat flux on smooth surfaces. The most commonly used correlations were analysed and the boiling phenomenon occurring on smooth surfaces has been discussed based on the experimental data. A modification of the Rohsenow model has been proposed with the values of the constants determined experimentally.
PL
Wrzenie to zjawisko związane ze zmianą fazy czynnika, które ma znaczny potencjał praktyczny z uwagi na wymianę dużych gęstości strumienia ciepła. Artykuł przedstawia metody wyznaczania gęstości strumienia ciepła wymienianego przy wrzeniu. Analizuje najczęściej stosowane korelacje i opisuje zjawisko wrzenia, odbywające się na powierzchniach gładkich, w oparciu o badania eksperymentalne. Zaproponowano modyfikację modelu Rohsenowa zawierającą nowe wartości stałych eksperymentalnych.
3
Content available Augmentation of Pool Boiling Heat Transfer Using the Laser Treatment Technology
Orman Łukasz J., Honus Stanislav, Radek Norbert, Kargul Marcin
Rocznik Ochrona Środowiska
|
2024
|
Tom 26
160--167
EN
The paper discusses applying the laser technique to modify the copper heater surface. The interaction of the laser beam with the base material leads to its melting, and various shapes can be obtained during the process. The study is focused on the boiling heat transfer analyses of the specimen in the form of a disc with longitudinal microfins of a height of 0.5 mm. The optical microscope was used to determine the morphology of the surface. The laser beam generated significant roughness, which benefitted the overall thermal performance. Considerable heat transfer augmentation was recorded for the laser–made surface in relation to the untreated sample, which served as a reference. The heat flux was several times higher, while the laser–treated sample's boiling curves were shifted to the area of smaller temperature differences. Two boiling models proved unsuccessful in predicting the heat exchange process occurring during pool boiling of distilled water and ethyl alcohol. According to the Smirnov, Xin and Chao models, the average differences between the experimental data and calculation results were ca. 93 kW/m2 and 116 kW/m2 for water, 78 kW/m2 and 68 kW/m2 for ethanol. boiling, heat exchanger, laser beam
4
Content available Temperature regimes of evaporator pipes at partial loading of power units
Ashurova Ulkar
Przegląd Elektrotechniczny
|
2024
|
R. 100, nr 10
59--63
EN
The results of the study of the temperature regimes of the evaporator tubes in the area around the critical pressure of one-phase and two phase are given in the paper. The studies carried out in the field of single-phase critical pressure environment can be classified into two groups according to their physical nature: 1) heat exchange process at large values of not heating the liquid up to the pseudocritical temperature at the inlet of the evaporator pipe; 2) heat exchange process at small values of at the pipe entrance. It is appropriate to use the proposed method in order to precalculate the temperature of the screen tubes in partial load modes of steam generators. With the help of this method, we can determine the reliability of the steam generator in this mode by checking the probability of occurrence of a deteriorated mode in the evaporator tubes in a given mode; The change of the temperature regime of the pipes in the area around the two-phase critical pressure is subject to a general regularity; Equations are proposed to calculate the temperature of the pipe wall in the degraded regime and the enthalpy of the fluid at the boundary of the degraded regime.
PL
W artykule podano wyniki badań reżimów temperaturowych rur parownika w obszarze wokół ciśnienia krytycznego jednofazowego i dwufazowego. Badania prowadzone w zakresie jednofazowego środowiska ciśnienia krytycznego można podzielić na dwie grupy ze względu na ich charakter fizyczny:1) proces wymiany ciepła przy dużych wartościach nieogrzewania cieczy do temperatury pseudokrytycznej na wlocie rury parownika; 2) proces wymiany ciepła przy małych wartościach na wejściu rury. Zaproponowaną metodę celowe jest zastosowanie do wstępnego obliczenia temperatury rur sitowych w stanach częściowego obciążenia wytwornic pary. Za pomocą tej metody można określić niezawodność wytwornicy pary w tym trybie, sprawdzając prawdopodobieństwo wystąpienia stanu pogorszonego w rurach parownika w danym trybie; Zmiana reżimu temperaturowego rur w obszarze wokół dwufazowego ciśnienia krytycznego podlega ogólnej prawidłowości; Zaproponowano równania umożliwiające obliczenie temperatury ścianki rury w reżimie zdegradowanym oraz entalpii płynu na granicy reżimu zdegradowanego.
5
Content available Application of laser treatment technology for boiling heat transfer augmentation
Orman Łukasz J., Radek Norbert, Honus Stanislav, Pietraszek Jacek
Production Engineering Archives
|
2024
|
Vol. 30, Iss. 2
259--265
EN
Boiling heat transfer can be enhanced when the heater’s surface morphology is altered. The paper discusses the use of the laser beam to produce efficient heat exchangers. Two types of samples were investigated with distilled water and ethyl alcohol as boiling agents. The specimens differed with the height of the microfins: 0.19 mm and 0.89 mm. It was observed that both of them enhanced boiling heat transfer in comparison to the smooth reference surface. However, the sample with higher micro-fins performed better, especially in the region of low temperature differences, where the heat flux was about three times higher than in the case of the smaller microfins. The comparison of the experimental data with selected models of boiling heat transfer revealed significant differences with regard to the heat flux. The laser-made samples dissipated larger heat fluxes than it could be anticipated according to the models. It might be linked with high surface roughness of the area between the microfins, generated as a result of the laser beam interaction with the surface.
6
Content available Critical analysis of pool boiling correlations
Radek Norbert, Orman Łukasz J., Honus Stanislav, Pietraszek Jacek
System Safety : Human - Technical Facility - Environment
|
2023
|
Vol. 5, iss. 1
258--265
EN
The manuscript describes the problem of boiling heat flux determination with the focus on nucleate boiling mode. It presents the boiling phenomenon on the bare surface and provides a review of the correlations that can be used for modelling purposes. Two most commonly applied correlations were validated against the experimental results. One of them showed significant discrepancies, which might be attributed to the conditions of the research and possible variations in the morphology of the heater. The other correlation proved to be successful in determining heat flux.
7
Content available Thermomechanical Homogenization in Steam Explosion
Pavlenkо Anatoliy, Koshlak Hanna, Basok Borys, Hrabova Tatiana
Rocznik Ochrona Środowiska
|
2023
|
Tom 25
9--15
EN
A steam explosion results from intense heat transfer when a thermolabile liquid phase comes into contact with a hot liquid. As a result of such contact, microdispersed fragmentation of a high-boiling liquid occurs. A mathematical model is proposed to describe the thermomechanical crushing process, considering the formation of a vapour layer at the interface between two phases and the force interaction concerning several simultaneously boiling particles of the dispersed phase.
8
Content available Determination of the Specific Heat Flux During Boiling of the Dispersed Phase of the Emulsion
Pavlenkо Anatoliy, Koshlak Hanna, Basok Borys, Hrabova Tatiana
Rocznik Ochrona Środowiska
|
2023
|
Tom 25
16--24
EN
The intensity of heat exchange between the boiling emulsion and the enclosing surfaces is associated with the physical phenomena of the formation, growth, and destruction of vapour bubbles of the low-boiling component in the liquid phase. This article presents a methodology to assess the intensity of heat exchange processes. Using this technique, it is possible to predict the energy parameters of heat exchange equipment and the degree of intensification of heat transfer processes.
9
Content available Pool boiling on horizontal tube, evaluation of ten correlations
Baki Touhami, Sahel Djamel
Archive of Mechanical Engineering
|
2023
|
LXX, nr 4
481--495
EN
The heat transfer coefficient during the pool boiling on the outside of a horizontal tube can be predicted by correlations. Our choice was based on ten correlations known from the literature. The experimental data were recovered from the recent work, for different fluids used. An evaluation was made of agreement between each of the correlations and the experimental data. The results of the present study firstly showed a good reliability for the correlations of untsov [10], Stephan and Abdeslam [11] with deviations of 20% and 27%, respectively. Also, the results revealed acceptable agreements for the correlations of Kruzhlin [6], Mc Nelly [7] and Touhami [15] with deviations of 26%, 29% and 29% respectively. The remaining correlations showed very high deviations from the experimental data. Finally, improvements have been made in the correlations of Shekriladze [12] and Mostinski [9], and a new correlation was proposed giving convincing results.
10
Content available Discussion of the heat flux calculation method during pool boiling on meshed heaters
Orman Łukasz J., Radek Norbert, Pietraszek Jacek, Gontarski Dariusz
System Safety : Human - Technical Facility - Environment
|
2020
|
Vol. 2, nr 1
247--252
EN
The paper discusses nucleate boiling heat transfer on meshed surfaces during pool boiling of distilled water and ethyl alcohol of very high purity. It presents a correlation for heat flux developed for heaters covered with microstructural coatings made of meshes. The experimental results have been compared with the calculation results performed using the correlation and have been followed by discussion. Conclusions regarding the heat flux determination method have been drawn with the particular focus on the usefulness of the considered model for heat flux calculationson samples with sintered mesh layers.
11
Content available Survey on the nucleate pool boiling of hydrogen and its limits
Baki Touhami
Journal of Mechanical and Energy Engineering
|
2020
|
Vol. 4, No 2
157--166
EN
Nucleate pool boiling is a very efficient transfer regime with low temperature gradients, bounded between two heat flux values and which border transitions to other regimes, this phenomenon is well framed with correlations. Our study aims to clarify the applicability of this regime to liquid hydrogen and to develop reliable correlations for a useful and qualitative agreement. An exhaustive review on the nucleate pool boiling of hydrogen and the limits of this regime, whether are the onset nucleate boiling (ONB) and the critical heat flux (CHF) was made, allowing the collection of more than 1400 points from experimental setups, highlighting a variety of parameters. Five predictive correlations were drawn from the literature, graphical and statistical comparisons were made, two in five reveal acceptable results. After analysis of the experimental data, new correlations were developed and compared with the data collected, convincing results were obtained and discussed. A simple form was expressed for the heat flux (...), shows better predicted values; convincing results of the (CHF) have been found on modified correlation, and the CHF value reaches a maximum of 148×103 W/m² for a reduced pressure at 0.35. A nucleate boiling correlation suitable for hydrogen has been developed.
12
Content available remote Intensyfikacja procesów wymiany ciepła w wymiennikach stosowanych w urządzeniach chłodniczych i pompach ciepła. Cz. 3
Rubik Marian
Ciepłownictwo, Ogrzewnictwo, Wentylacja
|
2020
|
T. 54, nr 9
15--26
PL
W artykule opisano metody intensyfikacji procesów w wymiennikach ciepła stosowanych w urządzeniach chłodniczych i pompach ciepła. Szczególną uwagę zwrócono na procesy dwufazowe i wpływ ich struktury na intensywność procesu przejmowanie ciepła przy wrzeniu i skraplaniu czynników chłodniczych, Oceniono wpływ modyfikacji powierzchni przekazywania ciepła na temperaturę wrzenia i skraplania oraz opory przepływu czynników przez wymienniki ciepła.
EN
The article describes methods of process intensification in heat exchangers used in refrigeration equipment and heat pumps. Particular attention has been paid to two-phase processes and the influence of their structure on the intensity of the process of heat transfer at boiling and condensation of refrigerants. The influence of modification of heat transfer surfaces on the boiling and condensation temperature and resistance of the factors flowing through heat exchangers has been evaluated.
13
Content available remote Intensyfikacja procesów wymiany ciepła w wymiennikach stosowanych w urządzeniach chłodniczych i pompach ciepła. Cz. 1
Rubik Marian
Ciepłownictwo, Ogrzewnictwo, Wentylacja
|
2020
|
T. 54, nr 6
7--17
PL
W artykule opisano metody intensyfikacji procesów w wymiennikach ciepła stosowanych w urządzeniach chłodniczych i pompach ciepła. Szczególną uwagę zwrócono na procesy dwufazowe i wpływ ich struktury na intensywność procesu przejmowanie ciepła przy wrzeniu i skraplaniu czynników chłodniczych, Oceniono wpływ modyfikacji powierzchni przekazywania ciepła na temperaturę wrzenia i skraplania oraz opory przepływu czynników przez wymienniki ciepła.
EN
The article describes methods of process intensification in heat exchangers used in refrigeration equipment and heat pumps. Particular attention has been paid to two-phase processes and the influence of their structure on the intensity of the process of heat transfer at boiling and condensation of refrigerants. The influence of modification of heat transfer surfaces on the boiling and condensation temperature and resistance of the factors flowing through heat exchangers has been evaluated.
14
Content available remote Intensyfikacja procesów wymiany ciepła w wymiennikach stosowanych w urządzeniach chłodniczych i pompach ciepła. Cz. 2
Rubik Marian
Ciepłownictwo, Ogrzewnictwo, Wentylacja
|
2020
|
T. 54, nr 7-8
24--32
PL
W artykule opisano metody intensyfikacji procesów w wymiennikach ciepła stosowanych w urządzeniach chłodniczych i pompach ciepła. Szczególną uwagę zwrócono na procesy dwufazowe i wpływ ich struktury na intensywność procesu przejmowanie ciepła przy wrzeniu i skraplaniu czynników chłodniczych, Oceniono wpływ modyfikacji powierzchni przekazywania ciepła na temperaturę wrzenia i skraplania oraz opory przepływu czynników przez wymienniki ciepła.
EN
The article describes methods of process intensification in heat exchangers used in refrigeration equipment and heat pumps. Particular attention has been paid to two-phase processes and the influence of their structure on the intensity of the process of heat transfer at boiling and condensation of refrigerants. The influence of modification of heat transfer surfaces on the boiling and condensation temperature and resistance of the factors flowing through heat exchangers has been evaluated.
15
Content available Experimental investigation and characteristics of multiwalled carbon nanotube aqua nanofluids from a flat plate heater surface in a pool
Vasudevan D., Senthil Kumar D., Murugesan A., Vijayakumar C.
Bulletin of the Polish Academy of Sciences. Technical Sciences
|
2020
|
Vol. 68, nr 3
547--554
EN
In this experimental investigation, the critical heat flux (CHF) of aqua-based multiwalled carbon nanotube (MWCNT) nanofluids at three different volumetric concentrations 0.2%, 0.6%, and 0.8% were prepared, and the test results were compared with deionized water. Different characterization techniques, including X-ray diffraction, scanning electron microscopy and Fourier transform infrared, were used to estimate the size, surface morphology, agglomeration size and chemical nature of MWCNT. The thermal conductivity and viscosity of the MWCNT at three different volumetric concentrations was measured at a different temperature, and results were compared with deionized water. Although, MWCNT-deionized water nanofluid showed superior performance in heat transfer coefficient as compared to the base fluid. However, the results proved that the critical heat flux is increased with an increase in concentrations of nanofluids.
16
Content available remote Destruction processes of oil films of emulsion environment
Klimov R. A., Pavlenko A. M.
Journal of New Technologies in Environmental Science
|
2018
|
Vol. 2, nr 2
75--83
EN
Most of the methods aimed at studying the dynamics of growth of vapor bubbles which occur either in the liquid volume or on a superheated surface [1-3]. A peculiarity of emulsion media boiling is that the formation of a vapor phase occurs on the surface of liquid interface if one liquid (for example, oil) is a superficially active substance or in the emulsion there is a superficially active substance (in multicomponent emulsions), which is based on a decrease in the interfacial tension at the interface between the dispersive medium (water) and the dispersion phase (oil) [1, 3-6]. Experimental data [1, 3] indicate that the process of a new phase (vapor) formation is initiated by an internal thermal impact on the surface of the oil particles. Thus, for example, with a sudden pressure decay, the preheated emulsion will be in the supersaturation state of the thermolabile-water phase (the water is superheated against the saturation temperature at a given pressure), i.e. it will contain an excessive amount of heat [7-10]. This heat excess is expended on the work of vapor layer formation and further vaporization. The effect of oil films is ambiguous: on the one hand, when heated, they play the role of thermal resistance, thus, slowing down the heating process; on the other hand, they are the heat carriers which can be used for the formation and growth of the vapor phase and also they are superficially active substance, which contributes to achieving lower water supersaturation temperatures, i.e. early boiling [5]. The consideration of oil thermal effect plays an important role when regarding heat and mass transfer processes during the boiling of emulsion media. Theoretical description and analysis of heat and mass exchange processes in emulsions, associated with the presence of oil and oil films, allows us to study more in detail the process itself, as well as to offer optimal parameters and characteristics for the processes of obtaining and processing a fine emulsion.
17
Content available Experimental studies on the effect of the enhancemet of the heating surface on the heat transfer coefficient for boiling in closed volume
Grabowski M., Błachnio E.
Journal of Mechanical and Energy Engineering
|
2018
|
Vol. 2, No 2
121--130
EN
This article presents the results of experimental research on the effect of enhancing the heating surface on the heat transfer coefficient for boiling in a closed volume of ethyl alcohol and isopropyl alcohol. The aim of the research was determination of the impact of heat surfaces enhancements by applying circular cavities on heat transfer coefficient and on vapor structures formation during boiling. The study involved three brass samples with diameters equal to 50 mm, with different enhancements of the heating surface by drilled blind cavities. The research includes investigation of sample without cavities, sample with 133 circular cavities of diameter of 2 mm and sample with 61 circular cavities of diameter of 3 mm. On the basis of the research, the influence of the investigated heat exchange surface enhancement on the intensity of heat exchange was determined. The author’s own interface in the LabView environment for controlling and acquiring measurement data was developed. The boiling process was recorded with a high-speed camera, and based on the obtained video images, the recorded images were analyzed to determine the void fraction. The heat flux density, heat transfer coefficient were calculated and comparative diagrams of the obtained measurement results were made.
18
Content available remote Wpływ niedokładności prac instalacyjnych na działanie termosyfonowego wymiennika ciepła wspierającego ogrzewanie budynków
Wojtasik K., Zajączkowski B.
Ciepłownictwo, Ogrzewnictwo, Wentylacja
|
2018
|
T. 49, nr 7
251--256
PL
Termosyfony są pasywnymi urządzeniami transportującymi ciepło. Ich efektywność zależy od wielu parametrów, w tym od dokładności umieszczenia rury w stosunku do płaszczyzny pionowej. Może zdarzyć się, że w czasie montażu lub podczas użytkowania instalacji dojdzie do pochylenia termosyfonu. Wykazano, że nawet niewielkie odchylenie może wpływać na procesy cieplne wewnątrz urządzenia i prowadzić do powstawania tzw. wrzenia gejzerowego [5]. Celem artykułu jest ukazanie zależności w jaki sposób niewielkie pochylenie termosyfonu wpływa na działanie urządzenia. Dotyczy to szczególnie zmiany w rozkładzie temperatury wzdłuż rury oraz pojawieniu się fluktuacji ciśnienia. Badania eksperymentalne termosyfonu przeprowadzono z czynnikiem R134a i stopniem napełnienia 0,7. Badano działanie urządzenia w zakresie temperatury wody grzewczej od 40°C do 80°C oraz kątów pochylenia od 0° do 20°. Zaobserwowano powstawanie gejzerów jedynie przy pochyleniu 5° i 10°. W rzeczywistych instalacjach istnieje duże ryzyko niewielkiego odchylenia rury od idealnego pionu. Dodatkowo, zmiana parametrów geometrycznych (wydłużenie rury lub zmniejszenie średnicy) lub czynnika roboczego (na wrzący w niższym ciśnieniu) w porównaniu do tych użytych w badaniach może wpłynąć na nasilenie zjawiska [8]. Jest to prawdopodobne zwłaszcza przy dużym stopniu napełnienia i niewielkiej ilości ciepła dostarczanego do parowacza.
EN
Thermosyphons are passive heat-transfer devices. Their efficiency depends on multitude of parameters, such as the accuracy of its installation in comparison to the vertical position. During installation or sometimes after longer operation, it is possible that the device will skew. It is proven that even little deviations influence boiling process inside the device and can caused so called geyser effect [5]. The aim of the article is to present the influence of lean angle on the operation of the device. It concerns mostly temperature distribution along the thermosyphon, as well as pressure fluctuations. Experimental campaign was carried out for refrigerant R134a and filling ratio 0.7. Different heating water temperatures (from 40°C to 80°C) and several lean angles (from 0° to 20°) were tested. Under specific thermal conditions we observed the occurrence of the geyser boiling. Geyser boiling was observed only for inclination angles 5° and 10°. In real installations it is common that small deviations from vertical positions can occur. Additionally, the change of geometrical parameters (increase in pipe’s length, reduction of internal diameter) or working medium (which boils at lower pressure) compared to those used for the tests may intensify the phenomenon [8]. It is the most likely for high filling ratio and small heating power applied to the evaporator.
19
Content available Analysis of unsteady boiling during high-temperatured body dipping in water
Badur J., Bryk M.
Transactions of the Institute of Fluid-Flow Machinery
|
2017
|
nr 138
75--88
EN
In this paper, the analysis of sudden water phase change during high-temperature metal body dipping is presented. According to that purpose, the computational fluid dynamic analysis has been carried out. The nonstationarity and behavior of sudden water phase change has been examined. The calculation model consists of the solid domain (vessel and high-temperature metal) and fluid domain (liquid filling vessel). The metal body insertion to the fluid domain was obtained by the use of dynamic mesh. Special case of the dipping velocity, the metal body of temperature 723 K and fluid temperature 288 K. was examined. Moving on to calculations, the model containing basic conservation equation, expanded of turbulence and liquid evaporation equations has been used.
20
Content available remote Enhancement of the boiling process of refrigerants with high temperature glide and low GWP
Niezgoda-Żelasko B.
Technical Transactions
|
2017
|
Vol. 5(114)
151--161
EN
The paper presents the results of experimental studies of the enhancement of the boiling process of a zeotropic agent with high temperature glide inside tubes at a low heat flux density. It discusses the effect of three types of inserts on the heat transfer process and the flow resistances during boiling of R407C in vertical tubes. The experimental studies covered measurements of heat transfer coefficient values, flow resistance values and thermal efficiency in the measurement section.
PL
Przedmiotem prezentowanej publikacji są wyniki badań eksperymentalnych intensyfikacji procesu wrzenia wewnątrz rur czynnika zeotropowego z dużym poślizgiem temperaturowym w warunkach niskich gęstości strumieni ciepła. W ramach pracy omówiono wpływ zastosowania trzech rodzajów wkładek na proces wymiany ciepła czynnika R407C i opory przepływu podczas wrzenia w rurach pionowych. Wyniki badań doświadczalnych obejmują pomiary wartości współczynników przejmowania ciepła, oporów przepływu oraz wydajności cieplnej uzyskiwanej w odcinku pomiarowym.
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