Thermohydraulic analysis of hydroformed radiation shield plate

Hydroformed panels are widely used in fusion reactor components as a thermal radiation shield, for cryopumps and cryostats. In a cryopump, the pumping surface area is cooled down below 5K and is shielded from direct outer thermal radiation by using radiation shield panel cooled at 80K. Therefore, high cryogenic operational mass flows are required and thus pressure drop and heat transfer characteristics are important aspects of study. CFD analysis for radiation shield plate (2045 mm × 1800 mm × 3 mm) has been carried out when gaseous helium at 15 bar and 80K was inserted under heat flux of 365 W/m². Further analyses were made for variable mass flow rate (i.e. 20 g/sec to 50 g/sec) to obtain optimum value of pressure drop with accurate thermal distribution on hydroformed shield plate.