Study on the effect of multiple spiral fins for improved phase change process
TL;DR: In this article, the melting and solidification rates of PCM in the annulus with four, 8, 16, and three kinds of distortion degrees of fin have been discussed. And the fin spacing is used to describe the overall effect of fin number and distortion degree.
About: This article is published in Applied Thermal Engineering.The article was published on 2020-03-25. It has received 54 citations till now. The article focuses on the topics: Fin & Heat transfer.
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TL;DR: In this article, the effect of fin pitch and position on the thermal performance of the melting process was quantified via analyzing the melting front evolution, temperature and velocity distribution, melting rate and temperature uniformity.
179 citations
TL;DR: In this article, a new type of triangular fin is proposed to improve the solidification performance of the triplex-tube thermal energy storage system, which can be reduced by up to 30.98% by the optimized triangular fin.
74 citations
TL;DR: In this article, the thermal performance of a LHTES unit equipped with vertical multitube shell and spiral-finned tube was investigated using paraffin as PCM and water as heat transfer fluid (HTF).
57 citations
TL;DR: In this paper, a double-tube latent heat thermal energy storage unit (M06) was proposed, which significantly reduces PCM melting time compared with vertical (76%), horizontal (66%), and helical-coiled (53%) systems.
45 citations
TL;DR: In this article, the thermal storage performance of phase change materials (PCM) depends upon fins, nanoparticles addition, container geometry, and orientations, and operating parameters such as heat transfer fluid temperature, flow rate, and initial temperature of storage material play a dominant role in PCM melting.
Abstract: Phase change materials (PCM) are employed to store thermal energy in solar collectors, heat pumps, heat recovery, hot and cold storage. PCMs are encapsulated primarily in shell-and-tube, cylindrical, triplex-tube, spherical, rectangular, and trapezoidal containers. This review focuses on PCM's melting and solidification in different container geometries and their orientations for heat storage in solar thermal systems. The thermal storage performance of PCM depends upon fins, nanoparticle addition, container geometry, and orientations. The operating parameters such as heat transfer fluid temperature, flow rate, and initial temperature of storage material play a dominant role in PCM melting. The use of fins and nanoparticles in the shell-and-tube containers increase the melting rate to 71 and 62.6%, whereas the change in container orientation improved the melting rate up to 47.5%. The addition of fins increases the melting rate significantly, followed by nanoparticles and the container's orientation. The variation of the container's geometry and its orientation improves PCM melting passively. Container materials are preferably stainless steel and aluminum for organic and inorganic PCMs to avoid corrosion. PCM container geometry and orientations are practical passive heat transfer enhancement techniques in the long-term compared to adding nanoparticles and attaching fins. This review focuses on significant aspects of PCM container designs for practical solar thermal storage.
42 citations
References
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Book•
01 Jan 1996
TL;DR: This text develops and applies the techniques used to solve problems in fluid mechanics on computers and describes in detail those most often used in practice, including advanced techniques in computational fluid dynamics.
Abstract: Preface. Basic Concepts of Fluid Flow.- Introduction to Numerical Methods.- Finite Difference Methods.- Finite Volume Methods.- Solution of Linear Equation Systems.- Methods for Unsteady Problems.- Solution of the Navier-Stokes Equations.- Complex Geometries.- Turbulent Flows.- Compressible Flow.- Efficiency and Accuracy Improvement. Special Topics.- Appendeces.
7,066 citations
TL;DR: In this article, the melting of pure gallium in a rectangular cavity has been numerically investigated using the enthalpy-porosity approach for modeling combined convection-diffusion phase change.
Abstract: The melting of pure gallium in a rectangular cavity has been numerically investigated using the enthalpy-porosity approach for modeling combined convection-diffusion phase change. The major advantage of this technique is that it allows a fixed-grid solution of the coupled momentum and energy equations to be undertaken without resorting to variable transformations. In this work, a two-dimensional dynamic model is used and the influence of laminar natural-convection flow on the melting process is considered. Excellent agreement exists between the numerical predictions and experimental results available in the literature. The enthalpy-porosity approach has been found to converge rapidly, and is capable of producing accurate results for both the position and morphology of the melt front at different times with relatively modest computational requirements. These results may be taken to be a sound validation of this technique for modeling isothermal phase changes in metallurgical systems.
1,377 citations
TL;DR: In this article, a tree-shaped fin with one and two bifurcations was proposed to enhance the performance of a shell-and-tube LHTES unit.
395 citations
TL;DR: In this paper, the melting process in a triplex-tube heat exchanger with phase-change material (PCM) RT82.26 was numerically investigated using the Fluent 6.3.
363 citations
TL;DR: In this paper, multi-walled carbon nanotubes (MWCNT)-based, graphene-based, and MWCNT/graphene-based composite phase change materials (PCM) were prepared and experimentally studied to improve the performance of lithium-ion power battery thermal management system.
290 citations