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ACRC Technical Report 145PDF


Title:An Investigation of Refrigerant Void Fraction in Horizontal, Microfin Tubes
Author(s):Yashar, D.A.; Wilson, M.J.; Kopke, H.R.; Graham, D.M.; Chato, J.C.; Newell, T.A.
Subject(s):two-phase flow
annular flow
stratified flow
micro fin tube
microgroove tube
void fraction
Abstract:A series of evaporation and condensation experiments have been performed on horizontal microfin tubes with refrigerants R134a and R410A. Mass flux varied from 75 kg/m2-s to 700 kglm2 -s and average test section quality varied from 5 percent to 80 percent. Zero degree (axial grooving) and 18 degree helix micro fin tube configurations have been examined in both condensation and evaporation. Four tubes were examined (7.3mm and 8.9mm diameters with axial and 18 degree helix angle microfins). Evaporation and adiabatic conditions in microfin tubes generally show similar void fraction trends found in smooth tubes. Condensation void fraction results tend to show a reduction in void fraction relative to smooth tube results, possibly indicating liquid filling of groove regions.
Issue Date:1999-08
Publisher:Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign.
Series/Report:Air Conditioning and Refrigeration Center TR-145
Genre:Technical Report
Sponsor:Air Conditioning and Refrigeration Project 74
Date Available in IDEALS:2009-05-22

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