Numerical Simulation Study On Natural Convection Heat Transfer From Rectangular Fins And Strip Fins

Nowadays, the fins are wildly used in electronic components cooling for its advantages, such as simple construction, high reliability, no need to maintain and so on. The rectangular fins are researched by CFD(computational fluid dynamics).Based on the groundwork, the slotted influence on finned heat dissipation is discussed. The main research works and results are as follows:(l)With the fluid numerical simulation technology, the relevant geometric model is set up. By contrast with experimental data, the veracity and feasibility of Numerical Computation Method are tested and verified.(2)Based on numerical calculation, the fins structure influences on heat dissipation are discussed. The results reveal that the cooling effect is enhanced with the spacing of fin adding, but when the spacing of fin reaches a certain value, the cooling effect becomes inconspicuous; with the fin length and fin height enlarging, the coefficient of heat transfer decreases, the heat dissipating capacity increases; and with the change of fin thickness, the cooling effect is not significant. By means of simulated data, the dimensionless criterion formula of Rectangular fin is obtained by using function fitting:By contrast with others’relational expression, it’s found that the maximal relative error is10.375%which is in the allowed range. By making reasonable orthogonal design, the influences on finned heat transfer coefficient by different parameter are discussed, it is found that the fin length plays the most important role in finned heat transfer coefficient.(3)Based on numerical calculation, the slotted influences on finned heat dissipation are discussed. The results reveal that the mean temperature of Fin surface decreases by0.261k; the Heat dissipation power increases by47.186; thecoefficient of heat transfer decreases by42.791%with the optimized apertures sizes. These results prove that the strip enhance the cooling effect. The influences of spacing of fin are discussed in the meantime. The results reveal that when narrowing down the spacing of fin, the Cooling area of fins is magnify, but the coefficient of heat transfer of fins surface is decrease; when the widening the spacing of fin, the Cooling area of fins is decrease, but the coefficient of heat transfer of fins surface is magnify. In the research scope of this paper, the cooling effect is best when the spacing of fins is12mm.