EXPERIMENTAL MEASUREMENT OF THE INTERFACE HEAT CONDUCTANCE BETWEEN NONCONFORMING BERYLLIUM AND TYPE 316 STAINLESS STEEL SURFACES SUBJECTED TO NONUNIFORM THERMAL DEFORMATIONS

摘要: In fusion blanket designs that employ beryllium as a neutron multiplier, the interface conductance h plays key role in evaluating blanket's thermal profile. Therefore, an extensive experimental program was conducted to measure magnitude of between nonconforming and Type 316 stainless steel surfaces subjected nonuniform deformations. The measured function relevant environmental, surface, geometric parameters, including surface roughness, contact pressure, gas type, direction heat flow. results indicate following: (a) Decreasing interfacial roughness from 6.28 0.28 {mu}m, 760 Torr helium, increased by up 100%; however, increasing reduced dependence on pressure. (b) significantly higher for measurements made helium opposed air. Additionally, sensitivity pressure greater runs and/or with smoother surfaces. This air roughened surfaces, it essentially nonexistent 6.25-{mu}m specimen pressures exceeding 76 Torr. (c) For vacuum,more » more sensitive flux than when were helium. (d) found be dependent flux. When specimens arranged so flowed disk, generally opposite direction.« less