Effectiveness-NTU Relations for Heat Exchangers With Streams Having Significant Kinetic Energy Variation-Reference-Cited by-同舟云学术

Effectiveness-NTU Relations for Heat Exchangers With Streams Having Significant Kinetic Energy Variation

Published:2003-03-21 Issue:2 Volume:125 Page:377-387
ISSN:0022-1481
Container-title:Journal of Heat Transfer
language:en
Short-container-title:

Author:

Nellis Gregory F.¹

Affiliation:

1. Department of Mechanical Engineering, University of Wisconsin, Room 1339 Engineering Research Building, 1500 Engineering Drive, Madison, WI 53706

Abstract

Effectiveness-NTU equations are derived for counter and parallel-flow heat exchangers with fluids having high velocities. In this case, the change in the kinetic energy occurring within the heat exchanger will significantly affect the temperature profiles. The effectiveness is found to depend on the usual non-dimensional variables that compare the heat exchanger conductance to the hot- and cold-side capacity rates and on four additional nondimensional quantities that reflect the magnitude and distribution of the kinetic energy on the hot and cold-sides of the heat exchanger. The governing differential equations are derived, nondimensionalized, and solved analytically for the case of an exponentially distributed kinetic energy. Graphical solutions are presented and interpreted for several cases. The solutions are applied to a particular case involving high velocities within a counter-flow heat exchanger used to produce cryogenic temperatures.

Publisher

ASME International

Subject

Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science

Link

http://asmedigitalcollection.asme.org/heattransfer/article-pdf/125/2/377/5755289/377_1.pdf

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