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- W4386475794 abstract "Natural convective heat transfer finds importance in applications such as cooling of low power electronics, Printed Circuit Boards (PCBs) and of components in a restricted space. The variable load on such components also warrants the study of transient behaviour. In this investigation, unsteady natural convection was numerically computed around thin horizontal flat isothermal plates of different shapes using commercial CFD solver Ansys FLUENT. The plates were maintained at 400K and exposed to air at ambient temperature of 300K. Boussinesq approximation was adopted. Transient heat transfer from the top and bottom surface of the plates were presented in terms of the Nusselt number, Rayleigh number and dimensionless time, calculated using two length scales- 4*Total Area/Total Perimeter and square root area of single side surface area. Rayleigh numbers between 10 -10 were considered. Analysis of the transient heat transfer profiles, calculated using the two length scales revealed that plate shapes had more pronounced effect on the heat transfer process compared to the length scale. Prior to reaching the steady state, the Nusselt number profile undergoes transition from initial conductive phase to convective flow development. Increasing the Rayleigh number tends to shorten the conduction and convective flow development phases. Further investigation revealed that unlike in laminar flow regime, the heat transfer in turbulent regime is significantly affected by fluid flow pattern, influenced by plate shape. Normalized Nusselt number was used to incorporate this shape effect, which enabled obtaining a singular transient heat transfer variation independent of plate shape and size. These profiles would assist the designers to compute the complete transient natural convective heat transfer characteristics of any plate shape using only the steady state heat transfer value." @default.
- W4386475794 created "2023-09-07" @default.
- W4386475794 creator A5071181611 @default.
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- W4386475794 date "2023-09-06" @default.
- W4386475794 modified "2023-09-27" @default.
- W4386475794 title "A numerical study of the transient natural convective heat transfer from thin, horizontal, isothermal plates of simple and complex shapes under turbulent flow conditions" @default.
- W4386475794 doi "https://doi.org/10.22541/au.169401250.05630852/v1" @default.
- W4386475794 hasPublicationYear "2023" @default.
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