Based On Inverse Heat Transfer Problem Optimization Of Two Dimensional Cooling Channel

The mini channel heat exchanging devices have more advantages like compact structure and greater heat exchanging efficiency and operating safely and reliably and such, and have been widely applied in many areas, for instance, in cyber domain, in aerospace field, and in fuel cells area and otherwise. As with the reducing gradually of the hydraulic diameters of the heat exchanger fluid channels, the convection heat coefficient of fluid and heat transfer capacities of the systems are obviously improved. However, the flow resistance increases significantly. Therefore, under the precondition of considering the cooling capacity and resistance of the system synthetically, it is an effective scheme to optimize the geometries of mini cooling channels to improve the heat transfer performance of the cooling channels under certain dynamic conditions.It is necessary to carry out investigation on the geometries optimization problems of cooling channels for improve the performance of plate cooling system evidently, aiming at the status quo of great flow resistance in internal and the main issues using the inverse heat transfer scheme.The main contents are as follows:1) The plate cooling system is considered in this work and the mathematic model of flow and heat transfer process is established. The governing equations are dispersed using the finite volume method. The coupling of fluid pressure and speed was handled by SIMPLE algorithm, the discrete algebraic equations are solved iteratively, and the applicability is verified. The cooling channel temperature and pressure distribution, and the heat exchange capacity, and the flow resistance of this system are studied with different heat transfer boundary conditions.2) This work introduces the basic idea to solve the inverse heat transfer problem using the conjugate gradient method (CGM). Combining the model of the cooling channel flow and heat transfer process, the geometry optimization problem is transformed into the inverse heat transfer problem. Considering the system cooling capacity and resistance synthetically, and taking the cooling channel geometry as the parameters to be optimized, the geometry optimization model and the objective function of the cooling channel geometry optimization problem are set up and then solved by the CGM.3) The geometry of cooling channel has been optimized by numerical simulation experiments, and the effects of the initial guesses of cooling channel geometry shape and the weight ratio of system cooling capacity and the flow resistance on the optimized results are discussed.Numerical experiment results show that when the inlet velocity of fluid and the height of the cooling channel entrance are given, the optimization method using for solving the inverse heat transfer problem can effectively optimize the shape of two dimensional mini cooling channel and improve the performance of cooling system evidently.