Доступ предоставлен для: Guest

ISSN Online: 2377-424X

ISBN Print: 1-56032-797-9

International Heat Transfer Conference 11
August, 23-28, 1998, Kyongju, Korea

HEAT TRANSFER ENHANCEMENT FROM A HEATED BLOCK BY FLOW PULSATION

Get access (open in a dialog) DOI: 10.1615/IHTC11.1840
pages 285-290

Аннотация

Numerical and experimental studies on heat transfer enhancement by flow pulsation have been carried out. The inlet unidirectional flow U1 contains a pulsating component, while the inlet air is maintained at a constant temperature Tl. The pulsating flow is generated by a DC motor-driven piston with an angular velocity ω and a displacement ΔX. The block is electrically heated to provide a uniform heat flux q inside the channel. The time-dependent temperatures are measured along the block surfaces as well as at several selected locations inside the channel to figure out the impact of flow pulsation on thermal transport. By inducing flow pulsation, significant heat transfer enhancement is obtained according to the governing pulsating parameters, i.e. Strouhal number, Sr and the pulsating amplitude A. It is observed that there exists an optimal pulsating frequency SrF for the heat transfer enhancement. The unsteady Navier-Stokes and energy equations are also numerically solved to display the overall trend of heat transfer enhancement.