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International Journal of Fluid Mechanics Research
ESCI SJR: 0.206 SNIP: 0.446 CiteScore™: 0.5

ISSN Druckformat: 2152-5102
ISSN Online: 2152-5110

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International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.v25.i4-6.190
pages 662-676

Local Heat Transfer Characteristics of Horizontal in-Tube Evaporation

Samchul Ha
Home Appliance Research Lab., LG Electronics Inc., Gaeumjeong-Dong 391-2, Changwon, Kyoungnam 641-711, Korea
Arthur E. Bergles
Department of Mechanical, Aerospace, and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, New York; University of Maryland, College Park, Maryland; Massachusetts Institute of Technology, Cambridge, Massachusetts, USA

ABSTRAKT

Local heat transfer characteristics along the perimeter of horizontal tubes for evaporating R-12 were investigated with various parameters of different tube wall thickness, mass flux, heat flux, and quality. Plain copper tubes with outside diameter of 9.5 mm, and thicknesses of 0.8 mm and 0.4 mm were tested with indirect electrical wire heating. Circumferential and axial wall temperatures were measured, and exit flow visualization was carried out to understand the local heat transfer mechanism. Because of significant heat conduction for the present tubes, the circumferential wall superheat profile was quite flat and the wall superheat function was insensitive to the local heat transfer coefficient. A three-step model for predicting the circumferential heat transfer coefficient at the partially wetted flow is proposed. It is based upon a liquid film distribution that consists of the wavy film and the base film. The five parameters that characterize the predicted wall superheat were obtained by regression. The liquid film distribution predicted by the present model qualitatively agreed with flow visualization. Although a large variation in the circumferential heat transfer coefficient is predicted, the average heat transfer with and without considering the circumferential heat conduction was within 10% for a mass flux of 50 kg/(m2·s) and a heat flux of 5 kW/m2. The characteristics of the circumferentially averaged heat transfer coefficient were explained mainly by the liquid film wetting in separated flows.


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