Analysis of heat transfer and nanofluid fluid flow in microchannels with trapezoidal,rectangular and triangular shaped ribs |
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| Affiliation: | 1. Department of Mechanical Engineering, Aligoudarz Branch, Islamic Azad University, Aligoudarz, Iran;2. Young Researchers and Elite Club, Khomeinishahr Branch, Islamic Azad University, Khomeinishahr, Iran;3. Young Researchers and Elite Club, Mashhad Branch, Islamic Azad University, Mashhad, Iran;4. Department of Civil and Environmental Engineering, University of Louisville, Louisville, KY 40208, USA;5. Young Researchers and Elite Club, South Tehran Branch, Islamic Azad University, Tehran, Iran;1. Department of Power Mechanical Engineering, National Tsing-Hua University, Hsinchu City 30013, Taiwan, ROC;2. Department of System and Naval Mechatronic Engineering, National Cheng Kung University, Tainan City 701, Taiwan R.O.C.;1. School of Engineering and Materials Science, Queen Mary University of London, Mile End Road, London, E1 4NS, UK;2. Key Laboratory of Enhanced Heat Transfer and Energy Conservation, Ministry of Education, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing, China |
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| Abstract: | In the present study, the effect of triangular, rectangular and trapezoidal ribs on the laminar heat transfer of water-Ag nanofluid in a ribbed triangular channel under a constant heat flux was numerically studied using finite volume method. Height and width of ribs have been assumed to be fixed in order to study the effect of different rib forms. Modeling were performed for laminar flow (Re=1, 50 and 100) and nanofluid volume fractions of 0, 2% and 4%. The results indicated that an increase in volume fraction of solid nanoparticle leads to convectional heat transfer coefficient enhancement of the cooling fluid, whereas increasing the Nusselt number results in a loss of friction coefficient and pressure. Also, along with the fluid velocity increment, there will be an optimal proportion between heat and hydrodynamic transfer behavior which optimizes performance evaluation criteria (PEC) behavior. Among all of the investigated rib forms, the rectangular one made the most changes in the streamlines and the triangular form has the best thermal performance evaluation criteria values. For all studied Reynold numbers, heat transfer values are least for rectangular rib from. Therefore, trapezoidal ribs are recommended in high Reynold numbers. |
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| Keywords: | Ag/ water nanofluid Performance evaluation criteria Ribbed microchannel |
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