Experimental Study On Heat Transfer Characteristics Of Pump Assisted Two Phase Flow Heat Transfer System

With the increase of chip integration,heat loss of the chip is also rising, equivalent heat flux density also will be significantly increased. Under this background, the traditional cooling scheme has been unable to meet the increasingly stringent requirements of the cooling, continuous development of new heat sink for the electronic components of the cooling has become a development trend. This paper is the subject as the object of study design an efficient and practical electronic components pump driven two-phase flow cooling experimental system, through the study of this paper can be for the future of distributed electronic components cooling research provides new ideas and reference.This paper is based on engineering practice in high heat flux density, discrete distributed heat source, heating power with the time variation of the chip heat dissipation as the background design the auxiliary pump two-phase cooling experimental system, which is different from the conventional steam compression refrigeration system. The experimental system is advantage to high temperature refrigerant R114 as working fluid, and make full use of phase change principle and the micro channel, the heat transfer performance of three rectangular micro channel evaporators, whose aspect ratio is 4:1?2.5:1?2:1, have been analyzed under different mass flow rate and heat flux density, specifically with the following:1. According to the actual demand for the project, designed two-phase flow pump auxiliary cooling system, and participated in the experimental system of processing and debugging.2. Based on two-phase heat pump assisted experimental system, when the ambient temperature is 9.2?-19.4?, mass flow rate is 0.0058kg/s-0.0169kg/s and heat flux is 42.64Kw/m2-57.5Kw/m2, the heat transfer performance of three rectangular micro channel evaporators in different aspect ratio have been analyzed. Then the two-phase flow boiling heat transfer coefficient of three evaporators have been compared, the reasons for differences in heat transfer performance have been analyzed.3. The experimental data under varying operation conditions were compared with a new model of two-phase boiling heat transfer coefficient in micro channel, it will provide reference data for the design and calculation of flow boiling heat transfer of high temperature refrigerant R114 in micro channel.