Hydraulic characteristic analysis of a fully internal-flow cooling cryosorption-panel for CFETR torus cryopump

Abstract

The China Fusion Engineering Test Reactor (CFETR) will develop a high-performance cryopump for pumping the torus vaccum vessel. Cryosorption-panel is the key component of torus cryopump, which is applied to adsorb gaseous molecules in cryogenic conditions. Considering the special geometries of cryosorption-panel, a research campaign has been carried out by Institute of plasma physics, Chinese Academy of Sciences (ASIPP) to analyze the structure and assess the hydraulic performance of the cryosorption-panel. This research activity was performed by Finite Element Method (FEM) and Computational Fluid Dynamics Method (CFD). In this article, the cryosorption-panel structure was designed and analyzed, and five representative fluid fields with different geometries were chosen, modeled and numerical simulated. The inlet-outlet pressure drops and flow distribution data under mass flow rates between 0.03kg/s and 0.2kg/s was collected and quantitatively analyzed. By analyzing the simulation results, the influence of fluid field thickness and pin fin arrangement on hydraulic performance was summarized. For the cases with fluid field thickness of 4mm, 6mm, 8mm, the functional relationship of hydraulic resistance coefficient ξ versus Reynolds number (Re) was calculated respectively: ξ = 75.26Re−0.07475; ξ = 120.7Re−0.1464; ξ = 385.3Re−0.2876;