关键词: 层流, 脉动流, 强化传热, 横掠平板

Abstract: In order to study the heat transfer characteristics of a flat plane with uniform heat flux under the pulsating flow, an experimental setup was built. The heat transfer features of a High Temperature Co-fire Ceramic (HTCC) heating plane cluster in pulsating flow under different Reynolds numbers (Re=433～1733) were investigated. The pulsating frequency and pressure amplitude of the pulsating flow were 30 Hz and 165 Pa, respectively. Results showed that the pulsating flow with proper pulsating parameters (f=30 Hz, prms =165 Pa) has the capability to enhance obviously the heat transfer of the flat plane, and in this work, the enhanced heat transfer efficiency was at the value between 9.7% and 10.8%, changed linearly with the Reynolds number. Besides, results revealed that the heat transfer flux increases linearly with the Reynolds number no matter the flow is pulsating or not. However, the slop coefficient under the pulsating condition is larger, and is 1.26 times of that under the steady condition. Finally, results indicated that the addition of pulsating component in the steady flow increased the heat exchange inside the airflow.

Key words: laminar flow;pulsating flow, heat transfer enhancement;flow over a flat plane