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A Study on Heat Transfer and Pressure Drop in Flow Boiling of Binary Mixtures in a Uniformly Heated Horizontal Tube  

LIM, Tae-Woo (Pukyong National University)
PARK, Jong-Un (Pukyong National University)
KIM, Jun-Hyo (Mokpo National Maritime University)
Publication Information
Journal of Fisheries and Marine Sciences Education / v.14, no.2, 2002 , pp. 177-190 More about this Journal
Abstract
An experimental study was carried out to make clear heat transfer characteristics in flow boiling of binary mixtures of refrigerants R134a and R123 in a uniformly heated horizontal tube. Experiments were run at a pressure of 0.6 MPa both for pure fluids and mixtures in the ranges of heat flux $10{\sim}50{kW/m}^2$, vapor quality 0~100% and mass flux 150-600 $kg/m^2s$. Heat transfer coefficients of mixtures were reduced compared to the interpolated values between pure fluids both in the low quality region where the nucleate boiling is dominant and in the high quality region where the convective evaporation is dominant. Total pressure drop during two-phase flow boiling in a horizontal tube consists of the sum of two components, that is, the frictional pressure drop and pressure drop due to acceleration. The frictional pressure drop is the most difficult component to predict, and makes the most important contribution to the total pressure drop. On the other hand, the acceleration pressure drop resulting from the variation of the momentum flux caused by phase change is generally small as compared to the frictional pressure drop. There is no significant difference in measured pressure drop between mixtures and pure fluids. The correlation of Martinelli and Nelson predicted most of the present data both for pure and mixed refrigerants within 30%.
Keywords
Hent transfer; Pressure drop; Flow boiling; Horizontnl tube;
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