Heat Transfer to Water in Downward Flow in a Uniform Wall Temperature Vertical Tube at Low Graetz Numbers

[+] Author and Article Information
T. E. Mullin

Mechanical Engineering Department, Speed Scientific School, University of Louisville, Louisville, Ky.

E. R. Gerhard

Speed Scientific School, University of Louisville, Louisville, Ky.

J. Heat Transfer 99(4), 586-589 (Nov 01, 1977) (4 pages) doi:10.1115/1.3450746 History: Received March 01, 1976; Online August 11, 2010


This paper presents an experimental investigation of heat transfer to water in vertical tube flow. Results from both Heating in Upflow and Heating in Downflow with the Natural Convection Parameter (Gr Pr D/L)w held constant at a value of 5.5 × 105 are compared with the expression developed by Martinelli and Boelter. The Nusselt numbers for Heating in Downflow were slightly higher but, within experimental error, equivalent to those values obtained for Heating in Upflow . A description of the flowfield is presented for one set of conditions for Heating in Downflow .

Copyright © 1977 by ASME
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