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1
100%
Chemical and Process Engineering
EN Experimental investigation of heat transfer during pool boiling of two nanofluids, i.e. water-Al203 and water-Cu has been carried out. Nanoparticles were tested at the concentration of 0.01%, 0.1%, and 1% by weight. The horizontal smooth stainless steel tubes having 10 mm OD and 0.6 mm wall thicknes[...]
2
86%
Journal of Applied Mathematics and Computational Mechanics
EN In this article, we investigate the theoretical study of the magnetohy-drodynamic (MHD) non-orthogonal stagnation point flow of a nanofluid towards a stretching. The partial differential equations that model the problem are reduced to ordinary differential equations which are then solved analyticall[...]
3
81%
Journal of Theoretical and Applied Mechanics
2016 Vol. 54 nr 3 811--825
EN Due to significant improvement of thermal performance and other properties of nanofluids, this group of liquids is in high demand. According to the literature, the effect of nanoparticles on boiling heat transfer enhancement or degradation is not the same among different investigations. In the prese[...]
4
81%
Archives of Mechanics
2016 Vol. 68, nr 4 327--344
EN In this work an analysis of momentum, angular momentum and heat transfer during unsteady natural convection in micropolar nanofluids is presented. Selected nanofluids treated as single phase fluids, contain small particles. In particular, two ethylene glycol-based nanofluids were analyzed. The volum[...]
5
72%
Bulletin of the Polish Academy of Sciences. Technical Sciences
2015 Vol. 63, nr 2 465--474
EN This article aims to investigate the two-dimensional magnetohydrodynamic (MHD) boundary layer flow of nanofluid. Convective mass condition is introduced. Analysis has been discussed in the presence of an applied magnetic field. The Brownian motion and thermophoresis effects are incorporated. The ari[...]
6
72%
Przegląd Elektrotechniczny
PL W artykule przedstawiono zagadnienie wytrzymałości elektrycznej wybranych nanofluidów. Obiektami badań były roztwór fulerenu C60 w oleju mineralnym oraz koloid Fe3O4 w oleju mineralnym. Postawiono tezy, mówiące że w badanych nanofluidach można się spodziewać zjawiska budowania mostka wyładowczego i [...]
EN In the article the problems related to chosen nanofluids were presented. The research object were fullerene C60 in mineral oil and colloid Fe3O4 in mineral oil. It is possible to find such nanomodified materials that are able to generate breakdown bridge and nanomodificators which cause self-purific[...]
7
72%
Archives of Thermodynamics
EN An approach – relaying on application of nanofluid as a working fluid, to improve performance of the two-phase thermosyphon heat exchanger (TPTHEx) has been proposed. The prototype heat exchanger consists of two horizontal cylindrical vessels connected by two risers and a downcomer. Tube bundles pla[...]
8
72%
Bulletin of the Polish Academy of Sciences. Technical Sciences
2015 Vol. 63, nr 1 235--244
EN In this study, the onset of convection in an elastico-viscous Walters’ (model B’) nanofluid horizontal layer heated from below is considered. The Walters’ (model B’) fluid model is employed to describe the rheological behavior of the nanofluid. By applying the linear stability theory and a normal mo[...]
9
72%
Bulletin of the Polish Academy of Sciences. Technical Sciences
2017 Vol. 65, nr 3 383--390
EN In the present article, magneto-micropolar nanofluid flow with suction or injection in a porous medium over a stretching sheet for the heat and mass transfer is analyzed numerically. Both Hall and ion-slip effects are considered along with variable thermal diffusivity. The governing partial differen[...]
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72%
Archives of Thermodynamics
EN In this work, steady flow-field and heat transfer through a copper-water nanofluid around a rotating circular cylinder with a constant nondimensional rotation rate α varying from 0 to 5 was investigated for Reynolds numbers of 5–40. Furthermore, the range of nanoparticle volume fractions considered [...]
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72%
International Journal of Applied Mechanics and Engineering
2019 Vol. 24, no. 3 489--508
EN Hydromagnetic flow of water based nanofluids over a nonlinearly stretching sheet in the presence of velocity slip, temperature jump, magnetic field, nonlinear thermal radiation, thermophoresis and Brownian motion has been studied. The article focuses on Cu water nanofluid and Ag water nanofluid. The[...]
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International Journal of Applied Mechanics and Engineering
2018 Vol. 23, no. 4 1005--1013
EN In the present work, the effect of various dimensionless parameters on the momentum, thermal and concentration boundary layer are analyzed. In this respect we have considered the MHD boundary layer flow of heat and transfer over a porous wedge surface in a nanofluid. The governing partial differenti[...]
13
71%
Journal of Theoretical and Applied Mechanics
EN The problem of boundary layer flow and heat transfer of nanofluids over nonlinear stretching of a flat sheet in the presence of a magnetic field and chemical reaction is investigated numerically. In this paper, a new locally modified single-phase model for the analysis is introduced. In this model, [...]
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71%
Engineering Transactions
EN This article aims to implement the spectral quasilinearization method to examine the impact of a second-order slip flow and convective heating on boundary layer flow and heat transfer of a nanofluid over an extensible surface. The mathematical modeling of the flow problem is obtained by taking into [...]
15
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Engineering Transactions
EN The purpose of this paper is to study the thermal instability analysis of an elastico-viscous nanofluid layer heated from below. The Rivlin-Ericksen type fluid model is used to describe the rheological behavior of an elastico-viscous nanofluid. The linear stability criterion for the onset of both st[...]
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Journal of Theoretical and Applied Mechanics
2019 Vol. 57 nr 1 221--233
EN In this paper, Buongiorno’s mathematical model is adopted to simulate both natural convection and mixed convection of a nanofluid in square porous cavities. The model takes into account the Brownian diffusion and thermophoresis effects. Both constant and variable temperatures are prescribed at the s[...]
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Inżynieria i Aparatura Chemiczna
2012 Nr 5 213-215
PL Nanopłyny, czyli zawiesiny nanocząstek w płynie bazowym, mogą być otrzymywane metodą jedno- i dwustopniową. W metodzie jednostopniowej nanocząstki otrzymuje się bezpośrednio w płynie bazowym. W metodzie dwustopniowej nanocząstki otrzymane w postaci proszku zawieszane są w płynie bazowym. Przedstawio[...]
EN Nanofluids, i.e. suspensions of nanoparticles in base fluid, may be prepared either by the one- or two-step method. In the one-step method nanoparticles are synthesized directly in base fluid. In the two-step method nanoparticles prepared as a powder are suspended in base fluid. Influence of sonicat[...]
18
61%
International Journal of Applied Mechanics and Engineering
2013 Vol. 18, no. 3 631--642
EN In this paper, we study the effects of variable gravity on thermal instability in a horizontal layer of a nanofluid in an anisotropic porous medium. Darcy model been used for the porous medium. Also, it incorporates the effect of Brownian motion along with thermophoresis. The normal mode technique i[...]
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61%
International Journal of Applied Mechanics and Engineering
EN In this study, the influence of temperature and wall slip conditions on the unsteady flow of a viscous, incompressible and electrically conducting nanofluid squeezed between two parallel disks in the presence of an applied magnetic field is investigated numerically. Using the similarity transformati[...]
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61%
Journal of Theoretical and Applied Mechanics
2016 Vol. 54 nr 3 881--892
EN Thermo-fluid properties are required for numerical modeling of nano/micro devices. These properties are mostly obtained from results of molecular dynamics (MD) simulations. Therefore, efforts have been put in developing methods for numerical evaluation of fluid properties, such as pressure. In this [...]
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