Date:

2025-04-30

Title of Paper:

Experimental study on flow boiling heat transfer in rigid-tail rib-channel under rolling motion conditions

Journal:

Applied Thermal Engineering

Summary:

This study proposes a novel addition of rigid filamentous tail structure at the trailing edge of the ribs to enhance the heat transfer performance of flow boiling in mini-channel under rolling conditions. The flow boiling heat transfer characteristics of Novec649 in both rib-channel and rigid-tail rib-channel are experimentally investigated. Heat flux, inlet flow velocity, rolling angle and rolling period are considered as the variable parameters, which are 50 – 300 kW·m-2, 0.3 – 0.9 m·s-1, 0 – 15°, 10 – 20s, respectively. The experimental results show that the rigid-tail structure improves the heat transfer performance of the channels within the entire range of thermal parameters, while increasing the pressure drop at high heat flux and/or high velocity. Compared with rib-channel, the rigid-tail structure exhibits the strongest enhancement in flow boiling heat transfer performance under high heat flux of qeff = 300 kW·m-2 and high flow velocity of vin = 0.9 m·s-1, and the heat transfer coefficient can be increased by 6.93% at most. Increasing the rolling angle or decreasing the rolling period will decrease the average wall temperature by a maximum of 1.94°C and increase the heat transfer performance factor j by a maximum of 8% at vin = 0.3 m·s-1, qeff = 200 ~ 300 kW·m-2 for the rigid-tail rib-channel. Furthermore, the addition of a rigid-tail structure helps maintain smaller bubble sizes and a more uniform distribution in the mainstream region of the two-phase flow.

Co-author:

Lei Xie, Bin Hu, Yongsheng Xu, Mei Lin, Qiuwang Wang

Volume:

258

Page Number:

124468

Translation or Not:

No

Date of Publication:

2025-02-01