Roughness effect upon the flow of R134a refrigerant through rectangular microchannels

Ioan Mihai; Cornel Suciu; Liliana Patuleanu; Silviu Sprinceana

doi:10.1117/12.2070336

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20 February 2015 Roughness effect upon the flow of R134a refrigerant through rectangular microchannels

Ioan Mihai, Cornel Suciu, Liliana Patuleanu, Silviu Sprinceana

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Proceedings Volume 9258, Advanced Topics in Optoelectronics, Microelectronics, and Nanotechnologies VII; 92581O (2015) https://doi.org/10.1117/12.2070336
Event: Advanced Topics in Optoelectronics, Microelectronics, and Nanotechnologies 2014, 2014, Constanta, Romania

Abstract

The present paper investigates the impact of rectangular micro-channel surface quality upon the flow of R134 refrigerating agent over a rectilinear stretch. For the present investigations, heat exchangers were built from copper plates in which rectangular micro-channels were manufactured. The surface of each region containing micro-channels was accurately mapped by aid of laser profilometry and surface quality parameters were determined, including surface roughness. As micro-channel dimensions are a few tens of micrometers and surface roughness can in some cases of refrigerant flow, reach significantly close values, it is interesting to evaluate roughness influence upon flow speed. The flow regime has an important influence upon mass flow and heat transfer. It is important to study roughness influence upon the non-continuum effect, as pressure rises in the micro-channel (reaching maximum values up to 17·10⁵ Pa).

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Ioan Mihai, Cornel Suciu, Liliana Patuleanu, and Silviu Sprinceana "Roughness effect upon the flow of R134a refrigerant through rectangular microchannels ", Proc. SPIE 9258, Advanced Topics in Optoelectronics, Microelectronics, and Nanotechnologies VII, 92581O (20 February 2015); https://doi.org/10.1117/12.2070336

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