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首页> 外文会议>National Fluid Mechanics and Fluid Power Conference >ACOUSTIC ENHANCEMENT OF HEAT TRANSFER IN FURNACE TUBES
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ACOUSTIC ENHANCEMENT OF HEAT TRANSFER IN FURNACE TUBES

机译：炉管中传热的声学增强

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摘要

Enhancement of heat transfer from a heat source to a flowing fluid within a tube is a challenging problem with many practical applications. In this paper, experimental investigation of a high-frequency (20 - 33 kHz), high-intensity (500 - 1000 Watts) ultrasonic field as a potential heat-transfer "process intensifier" is undertaken. Heat-transfer enhancement data collected in a miniaturized furnace tube over a range of flow conditions and ultrasonic process parameters indicate that sonication provides significant augmentation only under near-static (e.g., stagnant) and low- Reynolds number flow conditions. With increasing flow velocity, cavitational and acoustic-streaming fields associated with ultrasound are rapidly diminished in importance, hence playing no role in bulk fluid heat transfer (unless input power levels or frequencies are suitably increased). However, some locations, such as those under porous deposits in water-wall tubes of boilers near the goose-neck portion, can spur further study to exploit the impact of ultrasonic heat-transfer enhancement. The critical parameter that determines the efficacy of ultrasonic enhancement of heat transfer appears to be the ratio of the characteristic ultrasonic field velocity (sum of cavitational and acoustic streaming velocities) to the prevailing flow velocity.
机译：利用许多实际应用，从热源从热源传递到流动的流体的热传递是一个具有挑战性的问题。本文采用了高频（20-33 kHz），高强度（500 - 1000瓦）超声波场的实验研究，作为潜在的传热“过程增强器”。在一系列流动条件和超声波工艺参数中，在小型炉管中收集的热传递增强数据表明超声处理仅在静态（例如，停滞）和低雷诺数流动条件下提供显着的增强。随着与超声波相关的流速增加，具有超声波相关的空化和声媒体场的重要性迅速降低，因此在散装流体传热中没有作用（除非输入功率水平或频率适当地增加）。然而，一些位置，例如那些在鹅颈部锅炉附近的锅炉的水壁管中的多孔沉积物下的位置可以进行进一步研究以利用超声波传热增强的影响。确定传热超声增强功效的关键参数似乎是特征超声场速度（空化和声流速度的总和）与主要流动速度的比率。

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