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首页> 外文期刊>International Journal of Heat and Mass Transfer >Numerical and analytic study on the time-of-flight thermal flow sensor
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Numerical and analytic study on the time-of-flight thermal flow sensor

机译：飞行时间热流量传感器的数值和解析研究

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摘要

In this study, a numerical study on the time shift of time-of-flight (TOF) thermal flow sensor is performed based on Finite Volume Method (FVM). The TOF is modeled as parallel cylinders, and the governing equations for transient fluid flow and heat transfer, as well as boundary conditions, are established. In order to provide a physical understanding, a simple analytic model is also developed, and an excellent agreement is shown between numerical and analytic results. Based on the validated simulation results, the effects of wire diameter, flow velocity, and fluid Prandtl number on the time shift is investigated. The results show that the convection time shift becomes negligible as either the wire diameter or the flow velocity decreases. The effect of the wire diameter on the time shift becomes insignificant as the wire diameter decreases beyond several tens of micrometers. The time shift is shown to increase as the Prandtl number of fluid increases. The suggested computational scheme, together with the simple analytic model, can be effectively utilized for calibrating and designing the TOF sensors.
机译：在这项研究中，基于有限体积法（FVM）对飞行时间（TOF）热流传感器的时移进行了数值研究。将TOF建模为平行圆柱体，并建立了瞬态流体流动和传热以及边界条件的控制方程。为了提供物理理解，还开发了一个简单的分析模型，并在数值和分析结果之间显示出极好的一致性。基于验证的仿真结果，研究了线径，流速和流体普朗特数对时移的影响。结果表明，随着金属丝直径或流速的减小，对流时间偏移可忽略不计。当线径减小超过几十微米时，线径对时间偏移的影响变得微不足道。随着流体的普朗特数增加，时间偏移显示为增加。所建议的计算方案以及简单的分析模型可以有效地用于TOF传感器的校准和设计。

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