Role of gradients and vortexes on suitable location of discrete heat sources on a sinusoidal-wall microchannel. Issue 1 (1st January 2021)

• Record Type: Journal Article
• Authors: Cheng, Liang; Zhu, Yufang; Band, Shahab S.; Bahrami, Dariush; Kalbasi, Rasool; Karimipour, Arash; Jahangiri, Mehdi; Chau, Kwok-Wing; Mosavi, Amir
• Is Part Of: Engineering applications of computational fluid mechanics. Volume 15:Issue 1(2021)
• Page Start: 1176
• Page End: 1190
• Publication Date: 2021-01-01
• Subjects: Microchannel -- discrete heat sources -- sinusoidal-wall -- entropy generation -- vortex; Computational fluid dynamics -- Periodicals; 620.10640285
• DOI: 10.1080/19942060.2021.1953608
• Languages: English
• ISSNs: 1994-2060

Abstract

Abstract : The idea of using the compact device with higher heat transfer potential has encouraged researchers to use microchannels. Creating sinusoidal walls is a technique leading to better effectiveness and smaller size. In this study, the effects of discrete heat sources location on heat transfer and pressure drop are investigated, using graphene nanoplatelets/water inside a sinusoidal microchannel. For this, discrete heat sources are installed in a smooth microchannel (layout A) and compared with two sinusoidal-wall microchannels. In layouts B and C, the heating sources are installed above the convergent/diverging sections, respectively. Since the velocity and temperature gradients are higher in the converging region, the heat exchange and pressure drop for layout B are greater than other ones. In other words, installing heating sources in these regions with high-temperature gradient has a more obvious positive efficacy on heat exchange. For the best layout (B), although the heat exchange compared to the base layout (A) is 37.5% higher, the pressure drop and entropy generation are higher by 79% and 35.2%, respectively. By introducing a new figure of merit (FOM), it is found that layout B is in the desirable zone.