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A study on pressure drop characteristics of refrigerants in horizontal flow boiling

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Abstract

An experimental investigation on the flow pattern and pressure drop was carried out for both an adiabatic and a diabatic two-phase flow in a horizontal tube with pure refrigerants R134a and R123 and their mixtures as test fluids. The observed flow patterns were compared to the flow pattern map of Kattan et al., which predicted well the present data over the entire regions of mass velocity in this study. The measured frictional pressure drop in the adiabatic experiments increased with an increase in vapor quality and mass velocity. These data were compared to various correlations proposed in the past for the frictional pressure drop. The Chisholm correlation underpredicted the present data both for pure fluids and their mixtures in the entire mass velocity range of 150 to 600 kg/m2s covered in the measurements, while the Friedel correlation was found to overpredict the present data in the stratified and stratified-wavy flow region, and to underpredict in the annular flow region.

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Abbreviations

D :

Tube inner diameter (m)

f:

Friction factor

g :

Mass velocity (kg/m2s)

L :

Tube length (m)

P :

Pressure drop (Pa)

q :

Heat flux (W/m2)

Re :

Reynolds number

X :

Mole fraction in liquid

Y :

Mole fraction in vapor

z :

Axial distance (m)

α:

Void fraction

β :

Vapor quality

ρ :

Density (kg/m3)

ε :

Viscosity (Pa s)

Ф :

Two-phase frictional multiplier

a :

Acceleration

f:

Friction

fo :

Total flow assumed as liquid

i :

Inlet of the heat transfer section

l:

Liquid

o :

Outlet of the heat transfer section

TP :

Two-phase

v :

Vapor

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Authors and Affiliations

  1. School of Mechanical Engineering, Pukyong National University, San 100, Yongdang-Dong, Nam-Gu, 680-739, Busan, Korea

    Tae Woo Lim & Kyu Il Han

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  1. Tae Woo Lim
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  2. Kyu Il Han
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Correspondence to Tae Woo Lim.

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Lim, T.W., Han, K.I. A study on pressure drop characteristics of refrigerants in horizontal flow boiling. KSME International Journal 17, 758–765 (2003). https://doi.org/10.1007/BF02983871

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  • DOI: https://doi.org/10.1007/BF02983871

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