Characteristics of R-123 two-phase flow through micro-scale short tube orifice for design of a small cooling system

Title
Characteristics of R-123 two-phase flow through micro-scale short tube orifice for design of a small cooling system
Author(s)
서태원진상록[진상록]성태종[성태종]김종원[김종원]
Keywords
ELECTRONICS; DEVICE
Issue Date
201110
Publisher
ELSEVIER SCIENCE INC
Citation
EXPERIMENTAL THERMAL AND FLUID SCIENCE, v.35, no.7, pp.1484 - 1489
Abstract
We present a new discharge coefficient correction method for the orifice equation for R-123 two-phase flows. In this method, an evaporator is mounted after the orifice as a vapor refrigeration cycle, and the evaporator is used to measure the quality of downstream flow through the orifice. Quality is estimated from the measured temperature and pressure of the evaporator inlet and outlet, respectively, instead of by direct measurement of quality. The condition of upstream flow of the orifice is the liquid state at 3 bar and 60 degrees C. The liquid flow is changed to two-phase flow after passing through the orifice. Orifice diameters of 300, 350, 400, and 450 mu m are used for the experiment, and the results are analyzed. Experiments are conducted for various conditions of flow rate between 20 and 70 ml/min and for cooling loads of 60, 80, and 100 W. The results show that the quality of flow downstream from the orifice can be calculated using the enthalpy difference between the inlet and outlet of the evaporator. An equation to determine the discharge coefficient is formulated as a function of quality. We expect that these results can be used to help design a small cooling system. (C) 2011 Elsevier Inc. All rights reserved.
URI
http://hdl.handle.net/YU.REPOSITORY/24415http://dx.doi.org/10.1016/j.expthermflusci.2011.06.008
ISSN
0894-1777
Appears in Collections:
공과대학 > 기계공학부 > Articles
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