Laminar pulsed flow heat transfer in a vertical, isothermal tube with and without buoyancy
- Louisiana State Univ., Baton Rouge, LA (United States). Mechanical Engineering Dept.
Numerical fluid flow and heat transfer results were obtained for a pulsed laminar flow through a vertical, isothermal-walled tube for Gr/Re = 0 (no buoyancy) and 30 (buoyancy) at a cyclic-averaged Reynolds number of 500. The pulsations resulted in cyclic-averaged Nusselt numbers, Nu{sub av}, that were greater than the steady, fully-developed laminar Nusselt number, with Nu{sub av} increasing with increasing frequency. The Nusselt number also increased with increasing amplitude, a, for Gr/Re = 0, but it remained virtually constant beyond a = 0.1 for Gr/Re = 30. Although the Nu{sub av} values at Gr/Re = 30 were greater than at Gr/Re = 0, they were offset by relatively large values of the cyclic-averaged dimensionless wall shear stress, {tau}{sub av}.
- OSTI ID:
- 458430
- Report Number(s):
- CONF-951135--; ISBN 0-7918-1751-2
- Country of Publication:
- United States
- Language:
- English
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