Influence of secondary flow angle and pin fin on hydro-thermal evaluation of double outlet serpentine mini-channel heat sink

• Published in: Results in engineering Vol. 16; p. 100670
• Main Authors: Al-Hasani, Hayder Mohammed, Freegah, Basim
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.12.2022; Elsevier
• Subjects: CFD; Double outlet; Heat sink; Pin fin; Secondary flow; CFD; Double outlet; Secondary flow; Pin fin; Heat sink
• ISSN: 2590-1230; 2590-1230
• DOI: 10.1016/j.rineng.2022.100670

Achieving high processing speed in electronic components combined with large amount of generated heat, this heat removed by heat sink. For extreme heat generated, a mini-channel liquid cooled heat sink is used. The aims of the present study are to enhance the efficiency of the serpentine mini-channel heat sink and to uniformly temperature distribute. To achieve that, several variables were studied, namely the double outlet, the secondary flow channel with different backwards angles (45°, 53°, 61°) and finally the combination of secondary flow with pin fin at different pitch distances (5d, 6d, 7d). Ansys Fluent 2020 R2 software was utilized to extract the numerical results. The two models were fabricated and tested experimentally, namely the Basic model and the optimum model (model F), to validate the numerical results. The results of validation showed a good agreement. The results show that the use of a double outlet serpentine mini channel heat sink leads to an increase in overall performance to 1.47 and a lower maximum base temperature. With an 8.7% increase in overall performance and an even lower base temperature, the secondary flow backward angle of 53° (model C) outperforms the other two angles. However, combining the secondary flow with the pin fin enhances the heat sink both thermally and hydraulically. The model F displays the maximum performance with a 1.79 and a Nusselt number of 9.64% as compared to the Basic model. •New models of serpentine mini-channel heat sinks are presented based on the fluid flow separation, inlet/outlet configurations, secondary channel flow, and combined pin fin with secondary channel flow.•New models are studied to enhance the Performance Evaluation Criteria, Nusselt number, and uniformity of base temperature.•The combined model with the pin fin and secondary bypass flow has maximum enhancement of PEC and lowest base temperature.•The PEC of the best model was 1.79 as compared to the Basic model.