Title

Mixed Convection in a Two-Dimensional Asymmetrically Heated Vertical Duct

Abstract

Measurements and predictions of mixed convection air flow in a vertical two-dimensional duct that is formed by one adiabatic wall and one uniform temperature wall are reported. Velocity distributions and wall heat flux were measured by using a Laser-Doppler Velocimeter (LDV) and a Wollaston Interferometer (WI), respectively, for different buoyancy force effects and for various inter-wall spacings. Reversed flows were observed adjacent to the adiabatic wall when the inlet air flow was restricted to a level below the natural convective value (starved flow conditions). Velocity distributions skew toward the heated wall as a result of the asymmetric heating, and the occurrence of flow reversal diminishes as the bouyancy force decreases. The occurrence of reversed flow adjacent to the adiabatic wall influenced significantly the velocity distribution in the duct, but it had only small effect on the heat transfer from the heated wall. Numerical predictions of velocity distributions and heat transfer compare well with measured values.

Meeting Name

American Society of Mechanical Engineers, Heat Transfer Division (1991, Minneapolis, MN, USA)

Department(s)

Mechanical and Aerospace Engineering

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 1991 American Society of Mechanical Engineers (ASME), All rights reserved.

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