Study the Heat Recovery Performance of Micro and Nano Metfoam Regenerators in Alpha Type Stirling Engine Conditions

IF 2.7 3区工程技术 Q2 ENGINEERING, MECHANICAL Nanoscale and Microscale Thermophysical Engineering Pub Date : 2018-04-02 DOI:10.1080/15567265.2018.1456581

Alireza Najafi Amel, S. Kouravand, P. Zarafshan, A. Kermani, M. Khashehchi

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引用次数: 11

Abstract

ABSTRACT This paper experimentally investigates the performance of micro and nano metfoam regenerators in alpha-type Stirling engine conditions. The thermal efficiency of this engine depends on performance of regenerator. Therefore, increase the heat recovery of regenerator raises the total efficiency. Accordingly, two types of regenerators from porous media are designed and simulated with different materials. Three-dimensional regenerator CFD simulation shows that randomize porous open cell metfoam made of silver as high conductivity and high heat capacity material is the best structure to fabricate metfoam regenerator. The porosity and matrix element diameter are optimized. The nano coating methodology enhances the activated surface. The regenerators are fabricated using casting polymer mold layer deposition. The nano silver particles are coated on the metfoam by sol-gel coating method. Experimental results show the improvement in regenerator percentage of heat recovery by 3.40% and 5.93% for micro metfoam and nano metfoam, respectively. The maximum improvement is achieved up to 8.65% in case of using the nano metfoam regenerator at 543 K.

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在α型斯特林发动机条件下，研究了微纳米泡沫塑料蓄热器的热回收性能

实验研究了微纳泡沫再生器在斯特林发动机条件下的性能。这种发动机的热效率取决于蓄热器的性能。因此，提高蓄热器的热回收率可以提高总效率。据此，设计并模拟了两种不同材料的多孔介质蓄热器。三维再生器CFD模拟表明，以银为高导热、高热容材料的随机多孔开孔泡沫金属是制备再生器的最佳结构。优化了孔隙度和基体元件直径。纳米包覆方法增强了活化表面。该再生器采用浇铸聚合物模层沉积制备。采用溶胶-凝胶包衣法将纳米银颗粒包覆在泡沫金属表面。实验结果表明，微泡沫和纳米泡沫的回热率分别提高了3.40%和5.93%。在543 K的温度下，纳米泡沫再生器的最大改善达到8.65%。

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来源期刊

Nanoscale and Microscale Thermophysical Engineering 工程技术-材料科学：表征与测试

CiteScore

5.90

自引率

2.40%

发文量

审稿时长

3.3 months

期刊介绍： Nanoscale and Microscale Thermophysical Engineering is a journal covering the basic science and engineering of nanoscale and microscale energy and mass transport, conversion, and storage processes. In addition, the journal addresses the uses of these principles for device and system applications in the fields of energy, environment, information, medicine, and transportation. The journal publishes both original research articles and reviews of historical accounts, latest progresses, and future directions in this rapidly advancing field. Papers deal with such topics as: transport and interactions of electrons, phonons, photons, and spins in solids, interfacial energy transport and phase change processes, microscale and nanoscale fluid and mass transport and chemical reaction, molecular-level energy transport, storage, conversion, reaction, and phase transition, near field thermal radiation and plasmonic effects, ultrafast and high spatial resolution measurements, multi length and time scale modeling and computations, processing of nanostructured materials, including composites, micro and nanoscale manufacturing, energy conversion and storage devices and systems, thermal management devices and systems, microfluidic and nanofluidic devices and systems, molecular analysis devices and systems.