Roughness effect upon the flow of R134a refrigerant through rectangular microchannels.

被引：0

作者：

Mihai, Ioan ^{[1
]}

Suciu, Cornel ^{[1
]}

Patuleanu, Liliana ^{[1
]}

Sprinceana, Siviu ^{[1
]}

机构：

[1] Stefan Cel Mare Univ Suceava, Dept Mech Engn, Suceava 720229, Romania

来源：

ADVANCED TOPICS IN OPTOELECTRONICS, MICROELECTRONICS, AND NANOTECHNOLOGIES VII | 2015年 / 9258卷

关键词：

rectangular microchannels; R134a refrigerating agent; surface quality measurement; roughness; rarefaction; HEAT-TRANSFER;

D O I：

10.1117/12.2070336

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

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 17.10(5) Pa).

引用

页数：8

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