Flow and heat transfer behaviors of phase change material slurries in a horizontal circular tube

Wang, Xichun; Niu, Jianlei; Li, Yi; Wang, Xin; Chen, Binjiao; Zeng, Ruolang; Song, Qingwen; Zhang, Yinping

doi:10.1016/j.ijheatmasstransfer.2006.12.024

Cited by 141 publications

(66 citation statements)

References 18 publications

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“…Naturally, more unexpected results might be obtained with yet higher concentrations. The particle fractions studied herein (5-10 w-%) are rather high for nanofluids, but even higher concentrations are often studied in the class of micro PCM fluids (~30%) [2,5,28]. …”

Section: Convective Heat Transfermentioning

confidence: 99%

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Thermal properties and convective heat transfer of phase changing paraffin nanofluids

Mikkola

Puupponen

Saari

et al. 2017

International Journal of Thermal Sciences

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THERMAL PROPERTIES AND CONVECTIVE HEAT TRANSFER PERFORMANCE OF SOLID-LIQUID PHASE CHANGING PARAFFIN NANOFLUIDSWe aim to combine these two concepts for the first time by studying fluids containing nano-sized phase changing particles. In this study, the convective heat transfer performance and the thermal properties of solidliquid phase changing paraffin nanofluids are experimentally examined. Three water-based paraffin nanofluids with particle mass fractions of 5-10% are prepared and measured with an annular tube heat exchanger. The heat transfer measurements cover both laminar and turbulent regimes with Reynolds numbers varying in the range of 700-11000. The measurements also include pressure losses in order to study the suitability of the fluids for practical forced convection applications. In addition, the fluids are characterized: latent heats, specific heats, viscosities, thermal conductivities, densities and particle size distributions are all determined experimentally. In agreement with previous studies, the nanofluids are found to exhibit Nusselt numbers clearly higher than water when compared on the basis of equal Reynolds numbers. However, the differences in Prandtl numbers are shown to explain these deviations in Nusselt numbers. Indeed, the well-known Gnielinski correlation is able to explain the results quite adequately and thus, significant anomalies in the convection heat transfer caused by neither the melting of the phase change material nor the presence of the nanoparticles are observed. However, the nanofluids have systematically slightly higher Nusselt numbers than the correlation would predict, but the deviations are within the accuracy of the correlation (10%). When compared by using equal pumping powers, the nanofluids exhibit heat transfer performance poorer than that of water. The positive impact of the latent heat is outweighed by the negative effects of the increased viscosity and decreased specific heat.

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Section: Convective Heat Transfermentioning

confidence: 99%

“…In several studies, suspensions containing micro-sized PCM particles (typically 1-200 μm) have shown significant improvement in convective heat transfer performance [1][2][3][4][5]. However, the convection performance of such fluids containing nano-sized PCM particles has not been experimentally evaluated so far.…”

Section: Introductionmentioning

confidence: 99%

Thermal properties and convective heat transfer of phase changing paraffin nanofluids

Mikkola

Puupponen

Saari

et al. 2017

International Journal of Thermal Sciences

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“…Also, microencapsulated slurry founds its application in many fields some of them includes: in electronic cooling using micro channels, Various HVAC systems. Studies by Wang et al [29] depicts that PCM slurry offer better heat transfer coefficient in laminar fluids than single phase fluids but depicts complex phenomena at low turbulent conditions. Moreover, Microencapsulated Phase Change Material Slurry (MPCS) flowing in a circular tube were experimentally and numerically investigated, which showed enhanced convective heat transfer by Zeng et al [30] Numerical analysis of convective heat transfer enhancement with microencapsulated phase change material slurries have also been investigated by Hu and Zang [31].…”

Section: Resultsmentioning

confidence: 99%

Application of Phase Change Material in Sustainable Cooling of Data Centers

Dhiman

Shah

Agonafer

et al. 2013

Volume 8B: Heat Transfer and Thermal Engineering

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The ever increasing information technology heat load and data center cooling energy are the main reasons to investigate the performance of microencapsulated phase change slurry over other heat transfer fluids. Microencapsulated phase change slurry is dispersion where the phase change material, microencapsulated by a polymeric capsule, is dispersed in water. Compared to water, these new fluids have a higher heat capacity during phase change and a possible enhancement, as a result of this phase change, in the heat transfer phenomenon. The composition of phase change material used in slurry greatly affects its efficiency, If not selected properly it can cause serious damage, e.g. agglomeration and clogging of pipes. The main objective of this work is to develop standalone pumpable microencapsulated phase change slurry that is able to withstand shear stresses of the pump and other course surfaces of pipe and pipe joints. In this study, experiments were performed, to determine performance of microencapsulated phase change slurry over conventional heat transfer fluids. After certain pumping cycles, scanning electron microscopy (SEM) has been done to analyze the conditions of shell material of polymeric capsule. Results obtained from SEM show that centrifugal pump is compatible with mPCM particle size upto 3 μm. It is true that selected mPCS have shown better performance over water in hot water bath in case of thermal storage. Also, closed loop final testing has shown that heat flux is about 2–3 times higher with mPCS than water.

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“…A series of experimental investigations have been carried out to study the flow and convective heat transfer behaviours of MPCS by using microencapsulated 1-bromohexadecane (C 16 H 33 Br) as phase change material [139], [140], [141], [142].…”

Section: Forced Convection Heat Transfermentioning

confidence: 99%

“…Wang et al [139] developed a new laminar correlation equation from appropriate dimensionless group used in the convectional laminar convective correlations that could satisfactorily predict the local heat transfer data within the error of + 15 %.…”

Section: Forced Convection Heat Transfermentioning

confidence: 99%

Review on microencapsulated phase change materials (MEPCMs): Fabrication, characterization and applications

Zhao

Zhang

2011

Renewable and Sustainable Energy Reviews

408

147

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The use of latent heat storage, microencapsulated phase change materials (MEPCMs), is one of the most efficient ways of storing thermal energy and it has received a growing attention in the past decade. However, there is no complete overview of its utilisation in thermal energy storage systems, and the information is widely spread in the literature. In this paper, a comprehensive review has been carried out for MEPCMs. Four aspects have been the focus of this review: fabrication and characterization of MEPCMs, applications of MEPCMs to the textile and building, fundamental properties of microencapsulated phase change material slurry (MPCS) and application of MPCS to the thermal energy storage system. Over 140 recent publications are referenced in this paper.

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Flow and heat transfer behaviors of phase change material slurries in a horizontal circular tube

Cited by 141 publications

References 18 publications

Thermal properties and convective heat transfer of phase changing paraffin nanofluids

Thermal properties and convective heat transfer of phase changing paraffin nanofluids

Application of Phase Change Material in Sustainable Cooling of Data Centers

Review on microencapsulated phase change materials (MEPCMs): Fabrication, characterization and applications

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