The two-group coupled model with IATE is benchmarked with the recently available adiabatic phase-change flow datasets. The current state of adiabatic phase-change data is extensively discussed, followed by a thorough review of the two-group two-fluid model and the two-group IATE. The interfacial mass generation models from RELAP5/MOD3.3 are benchmarked and are observed to underpredict the group-2 interfacial mass generation rate which then causes underprediction of void fraction under flashing conditions. A new group-2 interfacial mass generation model is proposed using the mass-energy balance approach where slug bubbles are assumed as a cylinder with a constant width that only grows in the lengthwise direction. The proposed model is implemented to the two-group coupled model with IATE and benchmarked with the flashing datasets where the accuracy of the predicted values is significantly improved. Similar benchmark is carried out for flashing conditions with a near-zero initial void faction and adiabatic phase-change flows with an initial condensing phase followed by a flashing phase. It is observed that due to the lack of interfacial area concentration, the interfacial mass generation model is unable to produce a significant enough interfacial mass generation rate to allow the growth of bubbles. Bubble generation models are implemented to the simulations at flashing inception where improved results are obtained.

使用 IATE 的两组耦合模型以最近可用的绝热相变流数据集为基准。广泛讨论了绝热相变数据的当前状态，然后彻底审查了两组两流体模型和两组 IATE。对 RELAP5/MOD3.3 的界面质量生成模型进行了基准测试，并观察到它低估了第 2 组界面质量生成率，从而导致闪蒸条件下空隙率的预测不足。使用质量-能量平衡方法提出了一种新的第 2 组界面质量生成模型，其中将段塞气泡假定为具有恒定宽度且仅在纵向方向上生长的圆柱体。将所提出的模型实施到具有 IATE 的两组耦合模型，并使用闪烁数据集进行基准测试，其中预测值的准确性显着提高。对于具有接近零的初始空隙部分和具有初始冷凝阶段随后是闪蒸阶段的绝热相变流的闪蒸条件，进行了类似的基准测试。据观察，由于缺乏界面面积集中，界面质量生成模型无法产生足够显着的界面质量生成速率来允许气泡的生长。气泡生成模型在闪烁开始时被实施到模拟中，在那里获得了改进的结果。对于具有接近零的初始空隙部分和具有初始冷凝阶段随后是闪蒸阶段的绝热相变流的闪蒸条件，进行了类似的基准测试。据观察，由于缺乏界面面积集中，界面质量生成模型无法产生足够显着的界面质量生成速率来允许气泡的生长。气泡生成模型在闪烁开始时被实施到模拟中，在那里获得了改进的结果。对于具有接近零的初始空隙部分和具有初始冷凝阶段随后是闪蒸阶段的绝热相变流的闪蒸条件，进行了类似的基准测试。据观察，由于缺乏界面面积集中，界面质量生成模型无法产生足够显着的界面质量生成速率来允许气泡的生长。气泡生成模型在闪烁开始时被实施到模拟中，在那里获得了改进的结果。