ABSTRACT This research presents an alternative approach using numerical modelling for the prediction of simplified ultrasound distribution in a 3D water flow domain. The simulation was conducted using the Ansys-Fluent CFD commercial program. The results from this approach were compared with those from other researchers, covering an ultrasonic power range of 9.6–400 W and a frequency range of 24 kHz–1.7 MHz based on the parameters of mean axial and average velocity, Nusselt number, and the heat transfer coefficient. The maximum and minimum errors for the range of studies were 25.91% and 1.65%, respectively. Hence, this numerical setup can be utilized to achieve accurate prediction of the fluid flow and heat transfer over a controlled space which provides more realistic results for a whole domain with rapid calculation, especially in the far field region. Furthermore, this approach was applied to predict the augmentation of heat transfer in a vertically helical-coiled tube exchanger using 24 kHz ultrasonic waves. With very low numerical error, the results showed that the maximum thermal performance factor was 19% and 33% when the waves were emitted from one and two ultrasonic transducers at positions UT12 and UT12,9, respectively.

中文翻译：

---

使用等效超声传播数值建模的替代方法及其应用：预测由超声引起的垂直螺旋盘管换热器的传热性能

摘要 本研究提出了一种使用数值建模来预测 3D 水流域中简化超声分布的替代方法。仿真是使用 Ansys-Fluent CFD 商业程序进行的。将这种方法的结果与其他研究人员的结果进行了比较，基于平均轴向和平均速度、努塞尔数和热量等参数，超声波功率范围为 9.6-400 W，频率范围为 24 kHz-1.7 MHz。传递系数。研究范围的最大和最小误差分别为 25.91% 和 1.65%。因此，该数值设置可用于在受控空间内准确预测流体流动和传热，从而通过快速计算为整个域提供更真实的结果，尤其是远场区域。此外，该方法还用于使用 24 kHz 超声波预测垂直螺旋盘管换热器中传热的增强。结果表明，在非常低的数值误差下，当声波从 UT12 和 UT12,9 位置的一个和两个超声换能器发射时，最大热性能系数分别为 19% 和 33%。