Enhancement in heat transfer characteristics, thermal performance and optimized jet height of an ultrasonic pulsating jet of a piezoelectric micro-blower

IF 2.7 3区工程技术 Q2 ENGINEERING, MECHANICAL

Flow Measurement and Instrumentation Pub Date : 2025-08-16 DOI:10.1016/j.flowmeasinst.2025.103030

Bhola Keshao Rode, Sanjeevi Bharath, V.P. Chandramohan

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引用次数: 0

Abstract

A micro-blower is a compact device used for cooling compact electronic components through forced convection. The primary objective of this study is to numerically investigate the thermal performance of an ultrasonic pulsating jet produced by a micro-blower impinging on a heated surface and to determine the optimum nozzle-to-surface distance (H) for maximum heat transfer. A commercial 20 × 20 mm² micro blower with a nozzle diameter of 0.8 mm and height of 3.65 mm is used for this analysis. The H was varied from 1 to 8 mm and the optimum H for the maximum performance of the system was proposed. The heat transfer coefficient (h), Nusselt number (Nu), temperature of the hot surface (T_s) and enhancement factor (EF) were estimated. The h profile stabilized within 10 s proving that the micro blower reached its stability within 10 s. The h value was high that is more than 162 W/(m².K) at H = 2, 3 and 4 mm and proved that these heights can be chosen for better performance of micro blower. The maximum EF of 35.12 was achieved at H = 2 mm with an average h of 162.904 W/(m².K) and Nu of 4.446 hence this H can be proposed for better thermal performance. The results were compared to the existing literature and were in good accord. Such analysis was not found for micro-blower jet impingement hence the present study is an innovative approach.

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压电微型鼓风机超声脉动射流传热特性、热性能及射流高度优化研究

微型鼓风机是一种用于通过强制对流冷却紧凑电子元件的紧凑装置。本研究的主要目的是数值研究由微型鼓风机撞击加热表面产生的超声波脉动射流的热性能，并确定最大传热的最佳喷嘴到表面距离(H)。本分析使用的是20 × 20 mm2的商用微型鼓风机，喷嘴直径为0.8 mm，高度为3.65 mm。在1 ~ 8mm的H范围内，提出了系统性能最佳的最佳H。计算了传热系数(h)、努塞尔数（Nu）、热表面温度（Ts）和增强因子（EF）。h型曲线在10 s内稳定，说明微型鼓风机在10 s内达到稳定。h值较高，大于162w /(m2)。K)在H = 2,3和4mm，并证明了这些高度可以选择为更好的微型鼓风机性能。在H = 2 mm处EF最大，为35.12，平均H为162.904 W/(m2)。K)和Nu = 4.446，因此可以提出H以获得更好的热性能。结果与已有文献比较，符合较好。在微鼓风机射流撞击中没有发现这样的分析，因此本研究是一种创新的方法。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Flow Measurement and Instrumentation 工程技术-工程：机械

CiteScore

4.30

自引率

13.60%

发文量

123

审稿时长

6 months

期刊介绍： Flow Measurement and Instrumentation is dedicated to disseminating the latest research results on all aspects of flow measurement, in both closed conduits and open channels. The design of flow measurement systems involves a wide variety of multidisciplinary activities including modelling the flow sensor, the fluid flow and the sensor/fluid interactions through the use of computation techniques; the development of advanced transducer systems and their associated signal processing and the laboratory and field assessment of the overall system under ideal and disturbed conditions. FMI is the essential forum for critical information exchange, and contributions are particularly encouraged in the following areas of interest: Modelling: the application of mathematical and computational modelling to the interaction of fluid dynamics with flowmeters, including flowmeter behaviour, improved flowmeter design and installation problems. Application of CAD/CAE techniques to flowmeter modelling are eligible. Design and development: the detailed design of the flowmeter head and/or signal processing aspects of novel flowmeters. Emphasis is given to papers identifying new sensor configurations, multisensor flow measurement systems, non-intrusive flow metering techniques and the application of microelectronic techniques in smart or intelligent systems. Calibration techniques: including descriptions of new or existing calibration facilities and techniques, calibration data from different flowmeter types, and calibration intercomparison data from different laboratories. Installation effect data: dealing with the effects of non-ideal flow conditions on flowmeters. Papers combining a theoretical understanding of flowmeter behaviour with experimental work are particularly welcome.