Q2. What are the main factors in the thermal performance of a MPCS system?
Coolant flow rate and temperature, heat exchanger design factors, and the MPCS flow rate were important factors in thermal performance of such a loop system.
Q3. What enhancement ratio was used to quantify the enhanced heat transfer characteristics of the microencapsulated phase?
Two enhancement ratios, the traditional enhancement ratio and a modified enhancement ratio, were used to quantify the enhanced heat transfer characteristics of the microencapsulated phase change suspension for six major parameters.
Q4. What are the physical methods used for melamine resin microcapsules?
Physical methods are mainly spray drying or centrifugal and fluidized bed processes, which are inherently not capable of producing microcapsules smaller than 100 µm.
Q5. What are the chemical processes used in the fabrication of a microcapsule?
The chemical processes include the interfacial polymerization, in situ polymerization, the sample or complex coacervation, phase separation, suspension-like polymerization and other fabrication methods.
Q6. What are the main parameters for evaluating a natural convection in enclosures?
The results also indicated that “Rayleigh number”, “Prandtl number” and aspect ratio could be the main parameters for evaluating a natural convection in enclosures for most of Newtonian and nonNewtonian fluids.
Q7. What are the parameters that influence the heat transfer enhancement of MPCS?
Heat transfer enhancement were influenced by various sets of the relevant dimensionless parameters, including the particle volume concentration, the modified “Stefan number”, the “Peclet number” of MPCS, the wall thickness ratio, and the wall to fluid thermal conductivity ratio.
Q8. How did they determine the composition of the microcapsules?
They demonstrated that microcapsules contained more core material by either increasing the ratio of styrene to maleic anhydride groups in the copolymer, or by incorporating t-butyl styrene instead of styrene into the copolymer.
Q9. What were the properties of the treated fabrics?
The treated fabrics were quite promising in terms of its thermal storage/release, durability, and temperature sensing properties.
Q10. What is the potential of MEPCM for thermal energy storage?
Applications of MEPCM in the textile and building were presented; the results concluded that MEPCM had good potential for thermal energy storage purposes and it could be used for solar space heating as well.
Q11. What was the effect of the pressure drop reduction on the slurry flow?
The results showed that when particle volume fractions increased the slurry flow structure changed from turbulent to laminar, and the pressure-drop reduction of the slurry flow relative to a single phase water flow was under the same flow rate conditions.
Q12. What is the effect of a crosslinked on the surface of the microcapsule?
The presence of a crosslinked affects the morphology of the external microcapsule surface; the microcapsule external surface appeared smooth with a crosslinked.
Q13. What is the effect of adding octadecane to the microcapsule?
Zhang et al. [28] demonstrated that the degree of super-cooling of microencapsulated n-octadecane is decreased by adding 10.0 wt. % of 1-octadecanol as a nucleating agent.
Q14. What is the effect of convection on the heat transfer coefficient of MPCS?
The heat transfer coefficient of MPCS was increased by both effects of latent heat in phase change process and convection around particles with different diameters.
Q15. What is the thermal stability of n-octadecane?
The stirring rate, emulsifier content and cyclohexane content have effects on the diameters and morphology of the microencapsulated n-octadecane, as shown in Fig. 4 [22].
Q16. How many wt of Migrin oil was used in the microcapsules?
They concluded that the microencapsulation efficiency (%) was about 87 % and the loading amount of Migrin oil in the microcapsules was about 53 wt.