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Improved prediction of shell side heat transfer in horizontal evaporative shell and tube heat exchangers

Doo, G.H. and Dempster, W.M. and McNaught, J.M. and , DTI (Funder) and , EPSRC (Funder) and , TUVNEL (Funder) and , Hyprotech UK Ltd (now Aspen Technology Inc.) (Funder) (2008) Improved prediction of shell side heat transfer in horizontal evaporative shell and tube heat exchangers. Heat Transfer Engineering, 29 (12). pp. 999-1007. ISSN 0145-7632

Doo_Dempster_Improved_prediction_of_the_heat_transfer_and_pressure_drop_in_evaporative_shell_side_heat_exchangers_1_.pdf - Submitted Version

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This paper presents an improved prediction method for the heat transfer and pressure drop in the shell side of a horizontal shell and tube evaporator. The results from an experimental test program are used in which a wide range of evaporating two-phase shell side flow data was collected from a TEMA E-shell evaporator. The data are compared with shell side heat transfer coefficient and pressure drop models for homogeneous and stratified flow. The comparison suggests a deterioration in the heat transfer data at low mass fluxes consistent with a transition from homogeneous to stratified flow. The pressure drop data suggest a stratified flow across the full test range. A new model is presented that suggests the transition in the heat transfer data may be due to the extent of tube wetting in the upper tube bundle. The new model, which also takes into account the orientation of the shell side baffles, provides a vast improvement on the predictions of a homogenous type model. The new model would enable designers of shell side evaporators/reboilers to avoid operating conditions where poor heat transfer could be expected, and it would also enable changes in process conditions to be assessed for their implications on likely heat transfer performance. (Abstract from WOK)

Item type: Article
ID code: 19536
Keywords: flow patterns, 2-phase flow, cross-flow, transitions, bundles, model, Mechanical engineering and machinery, Mechanical Engineering, Fluid Flow and Transfer Processes, Condensed Matter Physics
Subjects: Technology > Mechanical engineering and machinery
Department: Faculty of Engineering > Mechanical and Aerospace Engineering
Depositing user: Strathprints Administrator
Date Deposited: 26 May 2010 15:46
Last modified: 24 Jul 2015 11:43

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