Abstract
In order to meet the waste heat discharge requirements of the 10kw compact Stirling thermoelectric micro-space reactor, the heat pipe radiator was selected as the waste heat discharge system of the reactor. The loop heat pipe is a two-phase heat transfer device. Due to its advantages of high efficiency, long heat transfer distance, good thermal control performance, flexible and convenient installation, etc., it has great application potential in spacecraft thermal control. The loop heat pipe is the key heat transfer element of the system, and its main components are evaporator, condenser, compensators and pipes connecting components. This paper studies the flow resistance calculation method and heat transfer characteristics of each internal component. As a two-phase heat exchange equipment, its flow resistance is mainly composed of the pressure drop inside the capillary core, the pressure drop in the steam channel, the pressure drop in the steam pipeline and the liquid pipeline, and the pressure drop in the serpentine pipeline in the condenser. The flow of the working fluid in the serpentine tube in the heat sink belongs to a typical gas-liquid two-phase flow. By studying the flow resistance and heat transfer calculation method of the loop heat pipe, it can provide a certain reference for the design and verification of the loop heat pipe, and provide a certain theoretical basis for engineering practice.
