A numerical method was used to study the effect of the broken rib locations on the heat transfer and flow structure in the latticework duct with various rotational numbers. The latticework duct had eleven sub-channels both on the pressure side and suction side. The crossing angle for each sub-channel was 45°. The numerical studies were conducted with five different broken rib locations and six rotational numbers (0 to 0.5). The flow structure, wall shear stress and Nusselt number distributions were analyzed. It was found that the upward spiral flow and helical flow dominated the flow structure in the latticework duct. In addition, the impingement region induced by the upward spiral flow was responsible for the high Nusselt number and wall shear stress. However, the turn region contributed to the low Nusselt number and wall shear stress in the latticework duct. After adoption of the broken rib near the impingement region and middle region, the flow structure and heat transfer characteristics only had small changes. However, the Nusselt number near the impingement region had an obvious increase by using the broken rib near the turn region. The reason was that the upward spiral flow became weaker and the impingement became stronger. In the rotating latticework duct, the high rotational number promoted the heat transfer on the suction side while suppressed the heat transfer on the pressure side.

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