In this research, a novel method to investigate the transient heat transfer coefficient in a channel is proposed, in which the water flow, itself, is considered both single-phase and two-phase. The experiments were designed to predict the temporal and spatial resolution of the Nusselt number. The inverse technique method is non-intrusive, in which time history of temperature is measured, using some thermocouples within the wall to provide input data for the inverse algorithm. The Tikhonov method is used as an inverse method. Error for estimation heat flux is around 0.06q_mean. The temporal and spatial changes of heat flux, Nusselt number, vapor quality, convection number, and boiling number have all been estimated, showing that the estimated local Nusselt numbers of flow for without and with phase change are close to those predicted previously. This study suggests that the extended inverse technique can be successfully utilized to calculate the local time-dependent heat transfer coefficient of boiling flow.

在这项研究中，提出了一种研究通道中瞬态传热系数的新方法，该方法将水流本身视为单相和两相。实验旨在预测Nusselt数的时间和空间分辨率。逆向技术方法是非侵入性的，其中使用壁内的一些热电偶为逆向算法提供输入数据，从而测量温度的时程。Tikhonov方法用作反方法。估计热通量的误差约为0.06 q_平均值。的估计了热通量，努塞尔数，蒸气质量，对流数和沸腾数的时空变化，这表明在无相变和有相变的情况下，估计的局部努塞尔特数均接近于先前的估计。这项研究表明，扩展逆技术可以成功地用于计算沸腾流的局部时间相关的传热系数。