Author
Sanjay K. Roy
Bio: Sanjay K. Roy is an academic researcher from University of Miami. The author has contributed to research in topics: Heat transfer & Phase-change material. The author has an hindex of 9, co-authored 15 publications receiving 866 citations.
Papers
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TL;DR: In this article, the heat transfer characteristics of microencapsulated phase change material slurry flow in circular ducts are presented by taking into consideration both the heat absorption (or release) due to the phase change process and the conductivity enhancement induced by the motion of the particles.
310 citations
TL;DR: In this paper, an experimental study using a suspension of n-eicosane microcapsules in water was conducted in order to evaluate the heat transfer characteristics of phase change material suspensions.
252 citations
TL;DR: In this paper, the analytical temperature distribution and efficiency of a heat pipe were derived and compared with experimental data, and the derived expressions are useful as a design tool to compare heat pipe designs to standard heat pipe design.
Abstract: Conclusions Expressions for the analytical temperature distribution and ef ciency of a heat pipe n were derived and compared with experimental data. Two heat pipe n cases were studied, ush mounted and inserted into the object. The derived expressions are useful as a design tool. They allow the designer to compare heat pipe ns to standard ns before doing a detailed heat pipe design. Further researchcould focus on variations in heat pipe design and geometry.Thesecouldincludenonconstantpropertiesandboundary conditions.For this work, the wall cross-sectionalarea, the internal convectioncoef cient, and the external convectioncoef cient were assumed constant. The impact of these assumptions on accuracy should be investigated. It would also be interesting to extend the analysis to ns in radiation environments.
109 citations
TL;DR: In this article, an experimental study of laminar forced convection heat transfer in a circular duct with a phase change material emulsion (n-octadecane in water) is presented.
71 citations
TL;DR: The results of an experimental study to evaluate the properties of microencapsulated phase change materials have been presented in this paper, where three different microcapsule sizes ranging from 50μ to 250μ have been considered.
61 citations
Cited by
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TL;DR: In this article, the authors used a Brookfield rotating viscometer to measure the viscosities of the dispersed fluids with γ-alumina (Al2O3) and titanium dioxide (TiO2) particles at a 10% volume concentration.
Abstract: Turbulent friction and heat transfer behaviors of dispersed fluids (i.e., uttrafine metallic oxide particles suspended in water) in a circular pipe were investigated experimentally. Viscosity measurements were also conducted using a Brookfield rotating viscometer. Two different metallic oxide particles, γ-alumina (Al2O3) and titanium dioxide (TiO2), with mean diameters of 13 and 27 nm, respectively, were used as suspended particles. The Reynolds and Prandtl numbers varied in the ranges l04-I05 and 6.5-12.3, respectively. The viscosities of the dispersed fluids with γ-Al2O3 and TiO2 particles at a 10% volume concentration were approximately 200 and 3 times greater than that of water, respectively. These viscosity results were significantly larger than the predictions from the classical theory of suspension rheology. Darcy friction factors for the dispersed fluids of the volume concentration ranging from 1% to 3% coincided well with Kays' correlation for turbulent flow of a single-phase fluid. The Nusselt n...
3,730 citations
TL;DR: In this article, the authors summarized previous works on latent thermal energy storage in building applications, covering PCMs, the impregnation methods, current building applications and their thermal performance analyses, as well as numerical simulation of buildings with PCMs.
1,569 citations
TL;DR: In this article, a review of thermal energy storage (TES) for cold storage applications using solid liquid phase change materials has been carried out, focusing on different aspects: phase change material (PCM), encapsulation, heat transfer enhancement, and the effect of storage on food quality.
851 citations
TL;DR: In this article, a supported phase change material (PCM) made of paraffin impregnated by capillary forces in a compressed expansed natural graphite (CENG) matrix is presented.
560 citations
TL;DR: In this article, a review of phase-change materials (PCMs) behavior prediction is presented, based on the first law and on the second law of thermodynamics, with selected results for several configurations, from numerous authors.
Abstract: Energy storage components improve the energy efficiency of systems by reducing the mismatch between supply and demand. For this purpose, phase-change materials are particularly attractive since they provide a high-energy storage density at a constant temperature which corresponds to the phase transition temperature of the material. Nevertheless, the incorporation of phase-change materials (PCMs) in a particular application calls for an analysis that will enable the researcher to optimize performances of systems. Due to the non-linear nature of the problem, numerical analysis is generally required to obtain appropriate solutions for the thermal behavior of systems. Therefore, a large amount of research has been carried out on PCMs behavior predictions. The review will present models based on the first law and on the second law of thermodynamics. It shows selected results for several configurations, from numerous authors so as to enable one to start his/her research with an exhaustive overview of the subject. This overview stresses the need to match experimental investigations with recent numerical analyses since in recent years, models mostly rely on other models in their validation stages.
559 citations