Research On Heat Transfer Characteristics Of Tempered Glass Based On Moving Field Impinging Jet

In the context of the rapid rise of the photovoltaic industry,tempered glass,as an important component of the solar battery,needs to consider its overall quality such as light transmittance,waviness,flatness and strength,etc.,before it can be used as a qualified product.Generally speaking,the difficulty in tempering glass is how to maintain high flatness while obtaining high strength.This article provides a moving field impact jet method with small spacing to study the heat transfer characteristics of tempered glass,and improve the quality from the most fundamental heat transfer problems.In this paper,through the theory of multiphysics,the coupling relationship of the field equations is obtained,so as to realize the data transfer between different fields.Then,on this basis,the geometric models of single-hole and multi-hole arrays were established,and the impinging jet theory was integrated to obtain the required mathematical model equations,and the COMSOL software was used for transient simulation.For single-hole jet,the effects of plate-jet velocity ratio(R_sj),jet-plate spacing（H/D）,and Reynolds number（Re）on the transient heat transfer characteristics of the three-field coupling of heat,fluid and solid are studied.Among them,the variation range of R_sjis 0～1,the variation range of H/D is0.2～2,and the variation range of Re is 300～30000.The behavior of the three fields is described in detail.The analysis shows that the moving field is a high-speed laminar flow when the distance is small,which improves and deteriorates the heat transfer strength and has good uniformity,while for the stress,the strength is improved but the uniformity is reduced.For the porous array jet,the influence of R_sj,H/D and the dimensionless jet-to-jet distance（S/D）on the transient heat transfer characteristics under the coupling of thermo-fluid-solid three-field coupling is studied.Among them,the total mass flow rate of the fixed jet（）is 30.34 kg/h,the range of R_sjis0～1,the range of H/D is 0.2～2,and the range of S/D is 5～10.The behavioral laws of the three physics fields are described in detail.The analysis shows that the flow field of the array jet is relatively stable in the moving field,and it is divided into the core area arranged by the number of holes.The heat transfer influence is the S/D,and there is an inflection point of the jet spacing H/D of 0.8.The stress intensity increases,and the uniformity increases with the decrease of S/D and the increase of the number of holes.Through the analysis of the heat transfer gain of the moving field,it is concluded that the biggest difference between a single hole and a multi-hole is that the windward surface and the central jet flanks flow around.The increase in the number of holes and the denseness are conducive to stabilizing the flow field,thereby enhancing the heat transfer of the coupling surface.In addition,the moving field watch core forms a large temperature difference,which is beneficial to the formation of tempered glass.The larger Reynolds number increases the heat transfer strength while reducing the heat transfer uniformity.As the speed becomes larger,the watch core with a small spacing has better heat transfer,while a large spacing sharply reduces the convection heat transfer intensity.Therefore,R_sj=1 and H/D=0.2 perform best,Re=10000 is the best for single hole,and S/D=5 is the best for porous.