Forced convection heat transfer in microencapsulated phase change material slurries: flow in circular ducts
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.
About: This article is published in International Journal of Heat and Mass Transfer.The article was published on 1991-03-01. It has received 310 citations till now. The article focuses on the topics: Heat transfer coefficient & Stefan number.
Citations
More filters
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
Cites background from "Forced convection heat transfer in ..."
...The flow and heat transfer characteristics of MPCM slurries have been investigated in recent years [80-84]....
[...]
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
Cites background from "Forced convection heat transfer in ..."
...This survey is organized according to the problem geometry (Cartesian, spherical, and cylindrical) and specific configurations or applications (packed beds, finned surfaces, porous and fibrous materials, slurries)....
[...]
...The authors apology for any crucial omission and welcome all authors to contact them to complete the review....
[...]
TL;DR: In this paper, the effect of uncertainties in the effective dynamic viscosity and thermal conductivity of nanofluid on laminar natural convection heat transfer in a square enclosure was identified.
523 citations
TL;DR: In this article, a detailed review of effect of phase change material (PCM) encapsulation on the performance of a thermal energy storage system (TESS) is presented, where the key encapsulation parameters, namely, encapsulation size, shell thickness, shell material and encapsulation geometry have been investigated thoroughly.
Abstract: This paper presents a detailed review of effect of phase change material (PCM) encapsulation on the performance of a thermal energy storage system (TESS). The key encapsulation parameters, namely, encapsulation size, shell thickness, shell material and encapsulation geometry have been investigated thoroughly. It was observed that the core-to-coating ratio plays an important role in deciding the thermal and structural stability of the encapsulated PCM. An increased core-to-coating ratio results in a weak encapsulation, whereas, the amount of PCM and hence the heat storage capacity decreases with a decreased core-to-coating ratio. Thermal conductivity of shell material found to have a significant influence on the heat exchange between the PCM and heat transfer fluid (HTF). This paper also reviews the solidification and melting characteristics of the PCM and the effect of various encapsulation parameters on the phase change behavior. It was observed that a higher thermal conductivity of shell material, a lower shell size and high temperature of HTF results in rapid melting of the encapsulated PCM. Conduction and natural convection found to be dominant during solidification and melt processes, respectively. A significant enhancement in heat transfer was observed with microencapsulated phase change slurry (MPCS) due to direct surface contact between the encapsulated PCM and the HTF. It was reported that the pressure drop and viscosity increases substantially with increase in volumetric concentration of the microcapsules.
484 citations
References
More filters
Book•
01 Jan 1966TL;DR: In this article, the echangeurs de : chaleur, couche de : limite, modeles de : turbulence, transfert de masse reference record created on 2005-11-18, modified on 2016-08-08
Abstract: Keywords: echangeurs de : chaleur ; couche : limite ; modeles de : turbulence ; transfert de masse Reference Record created on 2005-11-18, modified on 2016-08-08
4,465 citations
Journal Article•
2,683 citations
1,774 citations
TL;DR: In this article, the melting and freezing behavior of various heat-of-fusion storage materials is investigated using the techniques of Thermal Analysis and Differential Scanning Calorimetry.
1,455 citations