A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Experimental study of convective heat transfer coefficient for pulsed fluidized bed using microcapsule phase change material
The convective heat transfer coefficient in a pulsating cylindrical fluidized bed using microcapsule particle‐phase change material (MPCM) was examined experimentally. A solenoid on and off valve was used to provide the pulsation and was varied from 1 to 10 Hz. The test section in the bed was loaded with granular microparticle‐phase change material (MPCM) with an average diameter of 200 µm. The pulsation effect on the thermal field, thermal storage, and heat transfer coefficient was investigated for 1.5, 2, and 2.5 of minimum fluidization velocity. Results indicated that the amplitude of the oscillation decreases with increasing in pulsation frequency. An increase in heat transfer rate was shown to be related to the superficial velocity. The maximum performance was obtained for the frequency of 7 Hz at the velocity ratio of 2.5. The convective heat transfer increased by 17% for frequency pulsation of 7 Hz. Furthermore, the Duty cycle (η) is defined as the ratio of turn‐on duration to the total turn‐on and off duration for entering airflow to the solenoid valve. It was shown that the η > 0.4 led to better mixing and higher heat transfer. However, the pulsation effect was shown to disappear for the duty cycle of higher than 0.8. Comparison with the available experimental data of others for continuous flow was in good agreement.
Experimental study of convective heat transfer coefficient for pulsed fluidized bed using microcapsule phase change material
The convective heat transfer coefficient in a pulsating cylindrical fluidized bed using microcapsule particle‐phase change material (MPCM) was examined experimentally. A solenoid on and off valve was used to provide the pulsation and was varied from 1 to 10 Hz. The test section in the bed was loaded with granular microparticle‐phase change material (MPCM) with an average diameter of 200 µm. The pulsation effect on the thermal field, thermal storage, and heat transfer coefficient was investigated for 1.5, 2, and 2.5 of minimum fluidization velocity. Results indicated that the amplitude of the oscillation decreases with increasing in pulsation frequency. An increase in heat transfer rate was shown to be related to the superficial velocity. The maximum performance was obtained for the frequency of 7 Hz at the velocity ratio of 2.5. The convective heat transfer increased by 17% for frequency pulsation of 7 Hz. Furthermore, the Duty cycle (η) is defined as the ratio of turn‐on duration to the total turn‐on and off duration for entering airflow to the solenoid valve. It was shown that the η > 0.4 led to better mixing and higher heat transfer. However, the pulsation effect was shown to disappear for the duty cycle of higher than 0.8. Comparison with the available experimental data of others for continuous flow was in good agreement.
Experimental study of convective heat transfer coefficient for pulsed fluidized bed using microcapsule phase change material
Keshavarz, Mahmood (author) / Assari, Mohammad Reza (author) / Basirat Tabrizi, Hassan Professor (author)
Heat Transfer ; 51 ; 4205-4227
2022-07-01
23 pages
Article (Journal)
Electronic Resource
English
Heat Transfer Characteristics of the Phase Change Material Microcapsule Slurry in Solid Phase State
| British Library Conference Proceedings | 2011
Experimental study on the convective heat transfer coefficient of early-age concrete
| Online Contents | 2009
Experimental study on the convective heat transfer coefficient of early-age concrete
| Online Contents | 2009
Convective heat transfer coefficient in compartment fires
| SAGE Publications | 2013
Convective heat transfer coefficient in compartment fires
| Online Contents | 2013