Geometry optimization of two infinitive plates to enhance heat transfer through convection and thermal radiation

In this paper, geometry optimization of two infinitive plates by considering free convection and thermal radiation mechanisms in presence of air between these two plates is investigated. In this research, it is assumed that heat sources with length L are placed in an infinitive array in lower plate. Also, each of these heat sources are placed in distance L between each other. In this investigation, heat flux of heat sources, and temperature of the upper cold plate are our inputs, and mean temperature of heat sources, temperature difference between upper cold plate and mean temperature of heat sources, and Nuselt number are desired parameters in order to optimize the geometry ofplates. First of all, the problem is solved in two familiar geometries: when there exist the upper plate and when it is omitted. Eventually, a condition is studied in whichthere are tracks in lower and upper plates, best position of these tracks and also their size are the two primary aim of this investigation. Results of optimization show that particular geometry of two infinitive plates with some tracks on them can be very effective in enhancing the heat transfer from heat sources. In a particular array of two plates with heat sources and tracks on them, temperature difference between upper cold plate and mean temperature of heat sources is minimum. In other words, Nusselt number is the highest in comparison of other geometries and consequently maximum heat transfer is occurred.

کلیدواژه ها:

Optimization ، heat transfer ، free convection ، thermal radiation