Experimental investigation of convective heat transfer coefficient during downward laminar flow condensation of R134a in a vertical smooth tube

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Publication Details

Author list: Dalkilic A.S., Yildiz S., Wongwises S.

Publisher: Elsevier

Publication year: 2009

Journal: International Journal of Heat and Mass Transfer (0017-9310)

Volume number: 52

Issue number: #

Start page: 142

End page: 150

Number of pages: 9

ISSN: 0017-9310

eISSN: 1879-2189

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-57049140419&doi=10.1016%2fj.ijheatmasstransfer.2008.05.035&partnerID=40&md5=bc389ace540f51a33cd4599982f36463

Languages: English-Great Britain (EN-GB)

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Abstract

This paper presents an experimental investigation of laminar film condensation of R134a in a vertical smooth tube having an inner diameter of 7-8.1 mm and a length of 500 mm. Condensation experiments were performed at mass fluxes of 29 and 263 kg m-2 s-1. The pressures were between 0.77 and 0.1 MPa. The heat transfer coefficient, film thickness and condensation rate during downward condensing film were determined. The results show that an interfacial shear effect is significant for the laminar condensation heat transfer of R134a under the given conditions. A new correlation for the condensation heat transfer coefficient is proposed for practical applications. ฉ 2008.

Keywords

Laminar flow