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research-article

Experimental study of horizontal flow boiling heat transfer of R134a at a saturation temperature of 18.6C

[+] Author and Article Information
C.A. Dorao

Department of Energy and Process Engineering, Norwegian University of Science and Technology, Trondheim 7491, Norway
carlos.dorao@ntnu.no

Oscar Blanco Fernandez

ETSII, University in Madrid, Madrid 28006, Spain
1994oscarblanco@gmail.com

Maria Fernandino

Department of Energy and Process Engineering, Norwegian University of Science and Technology, Trondheim 7491, Norway
maria.fernandino@ntnu.no

1Corresponding author.

ASME doi:10.1115/1.4037153 History: Received October 12, 2016; Revised June 17, 2017

Abstract

Spite of the extensive work in flow boiling in small diameter tubes, the general characteristics and dominant mechanisms remain elusive. In this study, flow boiling heat transfer of R134a inside a 5 mm I.D., smooth horizontal stainless steal tube is experimentally studied. Local heat transfer coefficients were measured at two heat fluxes of 15 and 47 kW/m2, mass fluxes from 200-400 kg/m2s and at a saturation temperature of 18.6C with the goal of studying the effect of low and high heat fluxes on the heat transfer coefficients with a high resolution measurements approach. The studied cases have shown a noticeable difference between the low and high heat fluxes attributable to the main acting mechanisms, namely the convective contribution and the nucleation of vapor.

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