Experimental Study on Heat Transfer Characteristics of PFO-50 in Immersion Ribbed-Array Channels Under Natural Circulation Subcooled Boiling Conditions沉浸式肋片阵列通道内PFO-50在自然循环亚稳沸腾条件下的传热特性实验研究ASME Journal of Heat and Mass TransferIF1.82026-03-010PRE