The development of space experiment payload for studying thermocapillary convection in the liquid bridge with large Pr number on TG-2 space laboratory as well as the experiments are presented in detail in this paper, and the objectives of the space experiments are confirmed. The functions of the payload are analyzed, and the technical and engineering specifications are determined. Detailed designs and experimental verifications are performed on the structure of liquid bridge columns, the method of bubble removing in the liquid, the bridge cleaning system, the accurate control of aspect ratio and volume ratio, and the high-sensitivity measurement of fluid temperature. Matching experiments on the ground according to space experiment properties are carried out, 5cSt silicone oil is selected as the fluid medium in space experiments. And the states of liquid bridge and temperature oscillation signals obtained from space experiments are presented at the end of this paper. Specific summarizations and discussions to the experiment project on fluid science in space are conducted in this paper, which will provide a useful reference for scientists participating space experimental research in the future.

本文详细介绍了在TG-2空间实验室中研究大Pr数的液桥中热毛细管对流的空间实验有效载荷的开发以及实验，确定了空间实验的目的。分析了有效载荷的功能，并确定了技术和工程规格。对液桥塔的结构，液中除气泡的方法，桥清洗系统，长宽比和体积比的精确控制以及对流体温度的高灵敏度测量进行了详细的设计和实验验证。根据空间实验特性进行地面匹配实验，在空间实验中选择5cSt硅油作为流体介质。最后介绍了通过空间实验获得的液桥状态和温度振荡信号。本文对空间流体科学实验项目进行了具体总结和讨论，为今后参与空间实验研究的科学家提供了有益的参考。