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Effect of flow orientation in experimental studies on FC-770 boiling heat transfer in asymmetrically heated minichannels

Piasecka Magdalena, Strąk Kinga

Archives of Thermodynamics

2024

Vol. 45, no 2

29--39

The article presents experimental results of boiling heat transfer during FC-770 flow in a group of five minichannels with a common heated wall. The flow orientation was changed from 0º to 180º, with a 15° increment. During the experiments, the temperature of its outer heated wall surface was measured by an infrared camera. At the same time, flow patterns were captured through the glass plate opposite the heated wall using a high-speed camera. The purpose of the calculations was to determine local heat transfer coefficients on the contact surface between the working fluid and the heated surface in the central minichannel, using a simplified 1D calculation method. The results in the form of dependences of the temperature of the heated wall and the heat transfer coefficient as a function of the distance from the channel inlet for various flow orientations were analysed. Furthermore, typical boiling curves and two-phase flow patterns were presented. The mean relative error of the heat transfer coefficient was determined for various flow orientation. The dependence of the void fraction as a function of heat flux was illustrated for various angles of minichannel inclination to the horizontal plane. It was observed that the void fraction increased with heat flux and with increasing angle of inclination of the minichannel to the horizontal plane.

Rozwój logistyki w kierunku dyscypliny nauki

Blaik P.

Gospodarka Materiałowa i Logistyka

2017

nr 9

2--10

Artykuł dotyczy identyfikacji tożsamości współczesnej logistyki oraz rozwoju teoretycznych koncepcji logistyki w kierunku dyscypliny naukowej. Dyskusja dotycząca ewolucji logistyki i wyłonienia jej naukowego paradygmatu została zaprezentowana z perspektywy postępu idei/koncepcji i instrumentarium logistyki oraz fundamentów/podstaw niedawno zdefiniowanej w literaturze koncepcji rozumienia logistyki jako naukowej i akademickiej dyscypliny. Paradygmat naukowy logistyki postrzegany jest jako zestaw problemów i faktów dotyczących orientacji przepływowej i systemu przepływu w świecie zjawisk ekonomicznych i zarządczych jako wewnętrzne elementy tożsamości dziedziny logistyki.

The article concerns the identification of the contemporary logistics identity as well as the development of the theoretical logistics concepts towards the scientific discipline. The discussion about logistics evolution and logistics scientific paradigm emergence has been presented from a perspective of logistics ideas/concepts and tools progress, as well as cornerstones/fundamentals recently defined in the literature as a scientific and academic discipline. Logistics scientific paradigm is perceived as a set of problems and facts concerning flow orientation and flow system within the world of economic and management issues as the internal elements of logistics area identity.