Effect of geometrical parameters on the performance of nanofluid-based single phase natural circulation mini loops

IF 1.1 4区工程技术 Q4 Engineering

High Temperatures-high Pressures Pub Date : 2021-01-01 DOI:10.32908/hthp.v50.1019

N. Çobanoğlu, Mohmmad Alaboud, Z. H. Karadeniz

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Abstract

Single phase natural circulation loops are widely used passive systems in heat transfer applications. Since achievement of stable flow and highly efficient heat transfer is the main concern of recent studies, effects of geometry and the working fluid on the single phase natural circulation loops’ performance are getting attention. In this study, aspect ratio and pipe diameter effect on thermo-hydraulic performance of mini SPNCLs (SPNCmLs) has been investigated numerically by developing a 3D steady model. Water based Al2O3 nanofluid (1, 2, 3 vol. %) was used as a working fluid. Performance and characteristics of the loop for different working fluids is evaluated by using temperature distributions, mass flow rates and derived non-dimensional parameters. It is shown that pipe diameter effect on the heat transfer performance is more significant compared to aspect ratio. Moreover, nanofluids have higher temperatures and thus effectiveness values compared to water. In order to generalize the SPNCmL performance Num and Ress correlations were developed within the accuracy of ±10%.

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几何参数对纳米流体基单相自然循环微回路性能的影响

单相自然循环回路是一种广泛应用于传热的被动系统。由于实现稳定的流动和高效的传热是近年来研究的主要问题，因此几何形状和工作流体对单相自然循环回路性能的影响越来越受到关注。本文通过建立三维稳态模型，研究了长径比和管径对微型spncll热工性能的影响。采用水基Al2O3纳米流体(1,2,3 vol. %)作为工作流体。通过使用温度分布、质量流量和导出的无量纲参数来评估不同工作流体的回路性能和特性。结果表明，管径对换热性能的影响比长径比更为显著。此外，与水相比，纳米流体具有更高的温度和效能值。为了推广SPNCmL的性能，在±10%的精度范围内建立了Num和Ress相关性。

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来源期刊

High Temperatures-high Pressures THERMODYNAMICS-MECHANICS

CiteScore

1.00

自引率

9.10%

发文量

期刊介绍： High Temperatures – High Pressures (HTHP) is an international journal publishing original peer-reviewed papers devoted to experimental and theoretical studies on thermophysical properties of matter, as well as experimental and modelling solutions for applications where control of thermophysical properties is critical, e.g. additive manufacturing. These studies deal with thermodynamic, thermal, and mechanical behaviour of materials, including transport and radiative properties. The journal provides a platform for disseminating knowledge of thermophysical properties, their measurement, their applications, equipment and techniques. HTHP covers the thermophysical properties of gases, liquids, and solids at all temperatures and under all physical conditions, with special emphasis on matter and applications under extreme conditions, e.g. high temperatures and high pressures. Additionally, HTHP publishes authoritative reviews of advances in thermophysics research, critical compilations of existing data, new technology, and industrial applications, plus book reviews.