A New Equivalent Reynolds Number Model for Condensation in Smooth Tubes-Reference-Cited by-同舟云学术

A New Equivalent Reynolds Number Model for Condensation in Smooth Tubes

Published:1998-05-01 Issue:2 Volume:120 Page:410-417
ISSN:0022-1481
Container-title:Journal of Heat Transfer
language:en
Short-container-title:

Author:

Moser K. W.¹,Webb R. L.¹,Na B.²

Affiliation:

1. Department of Mechanical Engineering, The Pennsylvania State University, University Park, PA 16802

2. LG Electronics, Inc., Changwon, Korea

Abstract

In 1959, Akers et al. developed an in-tube condensation model, which defines the all-liquid flow rate that provides the same heat transfer coefficient as an annular condensing flow. This liquid flow rate was expressed by an “equivalent” Reynolds number and used in a single-phase, turbulent flow equation to predict the condensation coefficient. However, the assumptions on which the equivalent Reynolds number is based are shown in the present work to be faulty. This results in the underprediction of many researchers’ data. A new equivalent Reynolds number model, based on the heat-momentum analogy, is developed in this study. This model is then shown to predict the experimental Nusselt number of 1197 data points from 18 sources with an average deviation of 13.64 percent. The data are for tube internal diameters between 3.14 and 20 mm.

Publisher

ASME International

Subject

Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science

Link

http://asmedigitalcollection.asme.org/heattransfer/article-pdf/120/2/410/5557726/410_1.pdf

Reference35 articles.

1. Akers W. W. , DeansH. A., and CrosserO. K., 1959, “Condensing Heat Transfer Within Horizontal Tubes,” Chemical Engineering Progress Symposium Series, Vol. 55, No. 29, pp. 171–176.

2. Altman M. , StaubF. W., and NorrisR. H., 1960, “Local Heat Transfer and Pressure Drop for Refrigerant-Condensing in Horizontal Tubes,” Chemical Engineering Progress Symposium Series, Vol. 56, No. 30, pp. 151–159.

3. Azer N. Z. , AbisL. V., and SwearingenT. B., 1971, “Local Heat Transfer Coefficients During Forced Convection Condensation Inside Horizontal Tubes,” ASHRAE Transactions, Vol. 77, No. 1, pp. 182–201.

4. Azer N. Z. , AbisL. V., and SolimanH. M., 1972, “Local Heat Transfer Coefficients During Annular Flow Condensation,” ASHRAE Transactions, Vol. 78, No. 1, pp. 135–143.

5. Bae, S., Maulbetsch, J. S., and Rohsenow, W. M., 1968, “Refrigerant Forced Convection Condensation Inside Horizontal Tubes,” Report No. 79760-59, Department of Mechanical Engineering, Heat Transfer Lab., MIT, Cambridge, MA.

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