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Experimental and numerical studies of choked flow through adiabatic and diabatic capillary tubes

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Title Experimental and numerical studies of choked flow through adiabatic and diabatic capillary tubes
 
Creator DEODHAR, SD
KOTHADIA, HB
IYER, KN
PRABHU, SV
 
Subject FRICTIONAL PRESSURE-DROP
REFRIGERANT FLOW
2-PHASE FLOW
ALTERNATIVE REFRIGERANTS
PERFORMANCE
MODEL
SIMULATION
MIXTURES
Choked flow
Capillary tubes
Diabatic
Instability
 
Description Capillary tubes are extensively used in several cooling applications like refrigeration, electronic cooling etc. Local pressure variation in adiabatic straight capillary tube (mini channel) is studied experimentally and numerically with R134a as the working fluid. Experiments are performed on two straight capillary tubes. It is found that the diameter is the most sensitive design parameter of the capillary tube. Experiments are performed on five helically coiled capillary tubes to quantify the effect of pitch and curvature of helically coiled capillary tube on the pressure drop. Non dimensionalized factor to account coiling of capillary tube is derived to calculate mass flow rate in helically coiled capillary tubes. Flow visualization in adiabatic capillary tube confirms the bubbly nature of two phase flow. Numerical and experimental investigations in adiabatic capillary tube suggest that the use of positive displacement pump and choking at the exit of the channel ensures flow stability. (C) 2015 Elsevier Ltd. All rights reserved.
 
Publisher PERGAMON-ELSEVIER SCIENCE LTD
 
Date 2016-01-14T12:57:14Z
2016-01-14T12:57:14Z
2015
 
Type Article
 
Identifier APPLIED THERMAL ENGINEERING, 90,879-894
1359-4311
http://dx.doi.org/10.1016/j.applthermaleng.2015.07.073
http://dspace.library.iitb.ac.in/jspui/handle/100/17554
 
Language en