Analysis and experiment of the hypervapotron mock-up for the EAST upgrade
During the EAST upgrade, the peak heat flux applied on the first wall components will be 2 MW/m2, which requires powerful cooling concept to decrease the component temperature, in order to simplify the material requirement and armor/heat sink module design. Hypervapotron is a promising method for high heat transfer coefficient, which bases on sub cooling boiling phenomenon, and has the potential to support the demand in several years (up to 20 MW/m2 with strong armor), and is chosen to be a candidate. The design contains a copper heat sink and uses water as coolant, a series of CFD analyses are performed to optimize the design, and a mock-up based on this optimization is assembled on a high heat flux test facility which employs electromagnetic induction heating and high speed photography; during the experiment under the required working conditions, the flowing status and thermal parameters are recorded. The analysis and experiment confirm the performance of the hypervapotron concept and the feasibility of the use in the EAST upgrade project.
High Heat Flux Removal Using a Hypervapotron–II: Hypervapotron Wall Controlling Parameters
Abstract The hypervapotron (HV) has been demonstrated to be a superior thermal management (TM) and high heat flux removal (HHFR) technique for fusion reactor plasma-facing component applications involving a single-side absorbed heat flux (up to between 20 and 30 MW/m2). However, the conjugate heat transfer HV flow channel (HFC) only can be optimized completely when the related HHFR controlling parameters have been identified. In an earlier work, Part I of the present effort, we identified three high heat flux-side controlling TM and HHFR dimensionless parameters and a characteristic temperature difference. In the present work, six HV wall conjugate heat transfer dimensionless primary controlling parameters and five secondary controlling parameters have been identified. The controlling parameters include the effects of (1) most geometric specifications of the array of fins; (2) variations in the HV wall thermal conductivity and heat transfer coefficient; (3) effective Biot numbers characterizing effects that include the fin array, a typical fin example, and the side walls; (4) the HFC unobstructive portion flow aspect ratio, and (5) the HFC wall aspect ratio.
Development of high heat flux components in JAERI
Recent progress on the development of new divertor high heat flux components in JAERI is presented in this paper. Large-scale divertor mock-ups, 90 cm long/spl times/40 cm wide with carbon fiber composite armors, were fabricated and tested. The mock-ups withstood a heat load of 5 MW/m/sup 2/ for more than 3000 cycles, and 20 MW/m/sup 2/ for 1000 cycles. A small mock-up made of reduced activation ferritic steel without armors was also fabricated and tested. The mock-up endured a heat load of 5 MW/m/sup 2/ for 10,000 cycles.