A model for predicting heat transfer during condensation of refrigerant R134a in horizontal microchannels is presented. The thermal amplification technique is used to measure condensation heat transfer coefficients accurately over small increments of refrigerant quality across the vapor-liquid dome $(0<x<1)$. A combination of a high flow rate closed loop primary coolant and a low flow rate open loop secondary coolant ensures the accurate measurement of the small heat duties in these microchannels and the deduction of condensation heat transfer coefficients from measured $UA$ values. Measurements were conducted for three circular microchannels $(0.506<Dh<1.524mm)$ over the mass flux range $150<G<750kg\u2215m2s$. Results from previous work by the authors on condensation flow mechanisms in microchannel geometries were used to interpret the results based on the applicable flow regimes. The heat transfer model is based on the approach originally developed by Traviss, D. P., Rohsenow, W. M., and Baron, A. B., 1973, “Forced-Convection Condensation Inside Tubes: A Heat Transfer Equation For Condenser Design,” ASHRAE Trans., 79(1), pp. 157–165 and Moser, K. W., Webb, R. L., and Na, B., 1998, “A New Equivalent Reynolds Number Model for Condensation in Smooth Tubes,” ASME, J. Heat Transfer, 120(2), pp. 410–417. The multiple-flow-regime model of Garimella, S., Agarwal, A., and Killion, J. D., 2005, “Condensation Pressure Drop in Circular Microchannels,” Heat Transfer Eng., 26(3), pp. 1–8 for predicting condensation pressure drops in microchannels is used to predict the pertinent interfacial shear stresses required in this heat transfer model. The resulting heat transfer model predicts 86% of the data within $\xb120%$.

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# Measurement and Modeling of Condensation Heat Transfer Coefficients in Circular Microchannels

Todd M. Bandhauer,

Todd M. Bandhauer

Modine Manufacturing Company

, Racine, WI 53403
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Akhil Agarwal,

Akhil Agarwal

GWW School of Mechanical Engineering,

Georgia Institute of Technology

, Atlanta, GA 30332-0405
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Srinivas Garimella

Srinivas Garimella

GWW School of Mechanical Engineering,

srinivas.garimella@me.gatech.edu
Georgia Institute of Technology

, Atlanta, GA 30332-0405
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Todd M. Bandhauer

Modine Manufacturing Company

, Racine, WI 53403
Akhil Agarwal

GWW School of Mechanical Engineering,

Georgia Institute of Technology

, Atlanta, GA 30332-0405
Srinivas Garimella

GWW School of Mechanical Engineering,

Georgia Institute of Technology

, Atlanta, GA 30332-0405srinivas.garimella@me.gatech.edu

*J. Heat Transfer*. Oct 2006, 128(10): 1050-1059 (10 pages)

**Published Online:**March 7, 2006

Article history

Received:

June 17, 2005

Revised:

March 7, 2006

Citation

Bandhauer, T. M., Agarwal, A., and Garimella, S. (March 7, 2006). "Measurement and Modeling of Condensation Heat Transfer Coefficients in Circular Microchannels." ASME. *J. Heat Transfer*. October 2006; 128(10): 1050–1059. https://doi.org/10.1115/1.2345427

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