This study investigates the flow and heat transfer characteristics of microencapsulated phase change material suspensions in a square cavity by developing a coupled two-phase flow model that integrates the lattice Boltzmann method and discrete element method. The partially saturated cell method is employed to simulate the solid–liquid interface, while the effective specific heat method is adopted to capture the phase change behavior of microcapsule particles. A comprehensive analysis is conducted to examine the effects of microcapsule concentration, Rayleigh number, phase change temperature, and particle size on the suspension's flow and heat transfer performances. The results reveal that the inclusion of microcapsule particles significantly enhances the effective specific heat capacity of the suspension. Particle aggregation behavior is primarily influenced by the Rayleigh number. At lower Rayleigh numbers, particles are randomly distributed, while rapid aggregation occurs due to thermophoretic forces at high Rayleigh numbers. At a certain microcapsule concentration, the suspension achieves an optimal balance between heat capacity enhancement and flow stability. The results indicate that the microcapsule particles with a diameter of 75 μm can effectively release latent heat while avoiding the pronounced fluctuations associated with larger particles. Furthermore, the highest latent heat release efficiency is observed when the phase change temperature is close to the average cavity temperature. This study demonstrates that the Rayleigh number plays a pivotal role in governing the transition of the flow regime from laminar to turbulent by modulating the buoyancy-to-viscous force ratio, which in turn influences particle aggregation and heat transfer intensity of microencapsulated phase change material suspensions.
43Experimental study on natural convective heat transfer of tube immersed in microencapsulated phase change material suspensions
Experimental study on natural convective heat transfer of tube immersed in microencapsulated phase change material suspensions
Read more255An experimental study of convective heat transfer with microencapsulated phase change material suspension: Laminar flow in a circular tube under constant heat flux
An experimental study of convective heat transfer with microencapsulated phase change material suspension: Laminar flow in a circular tube under constant heat flux
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Study the hydro and thermal performance of microchannel heat exchanger with hybrid suspension of nanoparticles and MEPCM particles
This paper aims to study the flow and heat transfer of hybrid suspension in counter flow micro channel heat exchanger (CFMCHE). In order to enhance the thermal properties of micro encapsulated phase change material (MEPCM) suspension. The hybrid suspension studied in this paper consists of nanoparticles and MEPCM particles, these particles are suspended in water as abase fluid, two types of hybrid suspension are used (Cu + MEPCM suspension) and (Al2O3+ MEPCM suspension) by n-octadecane as a PCM for both of them. The hydrodynamic and thermal characteristics of thes suspensions flow in micro channels of CFMCHE is numerically investigated. From obtained results, using of hybrid suspensions as a cooling fluid lead to modify thermal performance of a CFMCHE by increase its effectiveness but it also lead to high increasing in pressure drop. The results showed considerable enhancement in cooling effectiveness of (Al2O3 + MEPCM suspension) above of the pure PCM suspension, Nanofluids, and water. While (Cu + MEPCM suspension) showed enhancement above of the pure PCM suspension and water, but was not best effectiveness than Nanofluids. Extra increase in pressure drop in both types of hybrid suspension above are leads to reduce the overall performance compared with pure PCM suspension. Therefore its use depends on the application at which this heat exchanger is employed
Read more42Experimental study on the performance of a liquid cooling garment with the application of MEPCMS
Experimental study on the performance of a liquid cooling garment with the application of MEPCMS
42Combined heat and mass transfer natural convection between vertical parallel plates
Combined heat and mass transfer natural convection between vertical parallel plates
14Numerical investigation on the performance of microencapsulated phase change material suspension applied to liquid cold plates
A three-dimensional thermo-hydrodynamic coupling model is established to study the performance of microencapsulated phase change material suspension (MEPCMS) applied to liquid cold plates. The cooling effect of three liquid cold plates with different flow channels is compared. And the liquid cold plate with the 3-elbow flow channel is chose to analyze the performance when using MEPCMS as coolant. The results show that compared with pure water, the MEPCMS not only can lower the maximum temperature of the liquid cold plate, improve the temperature uniformity, but also lessoning the load of the cooling system.
Read more88Numerical simulation of free convection of nanofluid in a square cavity with an inside heater
Numerical simulation of free convection of nanofluid in a square cavity with an inside heater
47Numerical investigation of heat transfer in the double-layered minichannel with microencapsulated phase change suspension
Numerical investigation of heat transfer in the double-layered minichannel with microencapsulated phase change suspension
Read more114Natural convection in a square cavity containing a nanofluid and an adiabatic square block at the center
Natural convection in a square cavity containing a nanofluid and an adiabatic square block at the center
172Novel insight and numerical analysis of convective heat transfer enhancement with microencapsulated phase change material slurries: laminar flow in a circular tube with constant heat flux
Novel insight and numerical analysis of convective heat transfer enhancement with microencapsulated phase change material slurries: laminar flow in a circular tube with constant heat flux
Read more18Forced convection performance of a MEPCM suspension through an iso-flux heated circular tube: an experimental study
The paper examines experimentally forced convection performance of a microencapsulated phase change material (MEPCM) suspension through an iso-flux heated circular tube. Forced convection experiments have been undertaken using the pure water or MEPCM suspensions as the working fluid. The heat transfer performance of the MEPCM suspension was gauged in terms of local/average heat transfer coefficients and temperature control effectiveness along the tube wall compared with that obtained for the pure water.
Read more46Microencapsulated phase change material suspensions for cool thermal energy storage
Microencapsulated phase change material suspensions for cool thermal energy storage
4The Lattice Boltzmann Simulation of Free Convection Heat Transfer of a Carbon-Nanotube Nanofluid in a Triangular Cavity with a Solar Heater
In this paper, the flow and free convection heat transfer of a multi-walled carbon nanotube/water nanofluid in a triangular cavity with a solar heater is studied using the lattice Boltzmann method. The side walls of the cavity are cold and the bottom wall is partially heated by a solar heater, which have a non-uniform temperature distribution. It is assumed that the heating energy is provided by an absorber that is directly exposed to sunlight. Because of the limited variations of density, the Boussinesq approximation is used, which causes the coupling of hydrodynamic and thermal fields. For velocity and temperature distribution functions, a lattice Boltzmann model with two dimensions and nine directions is adopted. The effect of parameters, such as the Rayleigh number, the volume fraction of nanoparticles, and the position of solar heater, on the flow and heat fields is studied. The results show that, for all Rayleigh numbers studied, the Nusselt number increases as nanoparticles volume fraction increases. The addition of 4% nanoparticles causes the average Nusselt number to increase about 11% at low (Ra = 103) and moderate (Ra = 104) Rayleigh numbers and 217% at the high Rayleigh number (Ra = 105). Furthermore, it is shown that for a fixed Rayleigh number, heat transfer can be optimized by adjusting solar heater’s position. This study can provide a useful insight for utilizing solar heaters with non-uniform temperature distribution in triangular cavities.
Read more13Free convection in open thermosyphon tubes of non‐circular section
This paper describes theoretical and experimental studies of laminar and turbulent free convection in the vertical open thermosyphon. Attention is concentrated on the effect of changes in the shape of the cross-section on the heat transfer. Two-dimensional theory developed in the paper gives a reliable indication of the termination of laminar boundary-layer flow in tubes of rectangular cross-section. Detailed measurements clearly illustrate the adverse effects of confined corner regions on heat transfer, particularly in laminar impeded flow. Even with a viscous fluid, confined rectangular sections seem capable of inducing a complete transition to fully mixed turbulent flow at unexpectedly low Rayleigh numbers. The circular section gives overall heat transfer generally superior to that of any non-circular section in laminar boundary-layer flow.In turbulent flow, at low Rayleigh numbers, unconfined circular and triangular sections provide best heat transfer; at high Rayleigh numbers, for fully developed, fu...
Read more3Buoyant convection of a variable-viscosity fluid in an enclosure with discrete protruding heaters
A study is made of buoyant convection in a rectangular enclosure, with protruding heaters attached on one vertical wall. The total amount of heat generated in the entire heaters is fixed. Numerical solutions to the Navier-Stokes equations are secured for the Rayleigh number ranging 104–108. In order to deal with more practical situations, a fluid of temperature-dependent viscosity is considered. Detailed descriptions are presented for the flow and temperature fields. Physical interpretations are provided for the heat transfer mechanism. At low Rayleigh number, heat transfer across the enclosure is invigorated as the number of heaters increases. At high Rayleigh number, there exist an optimum number of heaters that yields maximal system-wide heat removal in the enclosure.
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