A crucial parameter remarkably influencing the reliability and accuracy of vapor quality measurements in flow boiling experiments is the measurement of heat loss. The latent heat loss estimation in two-phase flow boiling sounds more demanding than that of sensible heat loss in single-phase flow experiments. To accurately investigate the impact of vapor quality on the heat transfer coefficient of flow boiling, accurate estimates of heat loss and subsequent calibration of heat supplies are of a great significance. It is widely common that the single-phase flow tests are performed to estimate a fixed heat loss percentage and calibrate heat supplies for further measurements of vapor quality and heat transfer coefficient of flow boiling experiments. In the present work, an empirical methodology is first proposed to measure heat losses and calibrate latent heat supplies directly from flow boiling process. The proposed methodology is then compared and verified with the commonly applied methodology which uses single-phase flow experiments. The proposed methodology exhibited higher accuracy than the single-phase-based methodology to estimate heat losses and measure vapor quality within two-phase flow boiling under low-pressure low-flow (LPLF) operating conditions.

中文翻译：

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低压低流量 (LPLF) 条件下水平两相流沸腾热损失测量的实验方法

显着影响流动沸腾实验中蒸汽质量测量的可靠性和准确性的一个关键参数是热损失的测量。两相流沸腾中的潜热损失估计听起来比单相流实验中的显热损失要求更高。为了准确研究蒸汽品质对流动沸腾传热系数的影响，准确估算热损失以及后续供热标定具有重要意义。通常，进行单相流测试是为了估计固定的热损失百分比并校准供热，以进一步测量流动沸腾实验的蒸汽质量和传热系数。在目前的工作中，首先提出了一种经验方法来测量热损失并直接校准来自流动沸腾过程的潜热供应。然后将所提出的方法与使用单相流实验的常用方法进行比较和验证。所提出的方法在低压低流量（LPLF）操作条件下估算热损失和测量两相流沸腾内的蒸汽质量时表现出比基于单相的方法更高的准确性。