Mixed convection heat transfer and pressure drop correlations for tube-in-shell thermosyphon heat exchangers with uniform heat flux

Scott D. Dahl, Jane H Davidson

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

An important issue arising from prior studies of thermosyphon heat exchangers for use in solar water heaters is the need for heat transfer and pressure drop correlations for the laminar, mixed-convection regime in which these many of these heat exchangers operate. In this paper, we present empirical correlations for tube-in-shell heat exchangers with the thermosyphon flow on the shell side. The correlations are determined for uniform heat flux on the tube walls. Ranges of Reynolds and Grashof numbers are 130 to 2,000 and 4×105 to 8×107, respectively. Nusselt number correlations are presented in a form that combines the contributions of forced and natural convection. Mixed convection dominates forced convection heat transfer in these geometries. Pressure drop is not significantly affected by mixed convection.

Original languageEnglish (US)
Title of host publicationSolar Engineering
EditorsJ.M. Morehouse, R.E. Hogan
PublisherASME
Pages101-110
Number of pages10
StatePublished - Jan 1 1998
EventProceedings of the 1998 International Solar Energy Conference - Albuquerque, NM, USA
Duration: Jun 14 1998Jun 17 1998

Other

OtherProceedings of the 1998 International Solar Energy Conference
CityAlbuquerque, NM, USA
Period6/14/986/17/98

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