Experimental heat-transfer coefficient between an immersed body and a gas fluidized bed at high temperature: Effect of particle size distribution and body shape

1993 ◽  
Vol 7 (2) ◽  
pp. 167 ◽  
Author(s):  
Leonardo Goldstein ◽  
R. Galvani ◽  
F.L. Fassani ◽  
G. Lombardi ◽  
J.D. Pagliuso
Keyword(s):  
Heat Transfer ◽  
Particle Size ◽  
Heat Transfer Coefficient ◽  
High Temperature ◽  
Particle Size Distribution ◽  
Body Shape ◽  
Experimental Heat ◽  
Experimental Heat Transfer ◽  
Effect Of Particle Size ◽  
High Temperature Effect

scholarly journals The analysis of thermal and flow characteristics of the condensation of refrigerant zeotropic mixtures in minichannels

2016 ◽  
Vol 37 (2) ◽  
pp. 41-69 ◽  
Author(s):  
Tadeusz Bohdal ◽  
Katarzyna Widomska ◽  
Małgorzata Sikora
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Pressure Drop ◽  
Transfer Coefficient ◽  
Flow Characteristics ◽  
Internal Diameter ◽  
Test Results ◽  
Experimental Heat ◽  
Experimental Heat Transfer ◽  
Calculation Results

Abstract The paper presents the results of experimental heat transfer and pressure drop during condensation of the single component refrigerant R134a and zeotropic mixtures R404A, R407C, and R410A in tube minichannels of internal diameter from the range 0.31-3.30 mm. The local values and the average of heat transfer coefficient and pressure drop in the whole range of the change in mass quality were measured. On the basis of the obtained test results there was illustrated the influence of the change of mass vapor quality, the mass flux density, and the inner diameter of channel on the studied parameters. These results were compared with the calculation results based on the relations postulated by other authors. The discrepancy range was ± 50%. On the basis of given test results own correlation was developed to calculate the heat transfer coefficient and pressure drop of tested refrigerants which presents the obtained results in a range of discrepancy of ±25%.

scholarly journals Thermal-hydraulic Assessment of Seven Wire-wrapped rod Bundle

2020 ◽  
Vol 212 ◽  
pp. 01009
Author(s):  
Kefeng Lyu ◽  
Xuelei Sheng ◽  
Xudan Ma
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Great Influence ◽  
Stable Condition ◽  
Forced Circulation ◽  
Experimental Heat ◽  
Rod Bundle ◽  
Experimental Heat Transfer ◽  
Accelerator Driven Systems

Lead bismuth eutectic (LBE) is one of the most potential materials for coolant and spallation target for Accelerator Driven Systems (ADS). Thermal-hydraulic behavior of LBE in fuel assembly is a key issue for development of the systems. To get a deeper understanding on the complex thermal-hydraulic features of wire-wrapped rod bundle cooled by upward LBE, an electrically bundle with 7 rods wrapped with helical wire was developed in KYLIN-II thermal-hydraulic forced circulation loop. The flow resistance, thermal entrance characteristic and heat transfer coefficient were investigated. As for the entrance characteristics, during the full heating length (exceeding 140 times the hydraulic diameter), the thermal field did not reach a fully developed and stable condition which is contrary to the ducted flows. The experimental heat transfer coefficient showed that the hexagonal shell has a great influence on the heat transfer coefficient in rod bundle geometry. For this reason the application of empirical correlation should be kept cautious in rod bundle analysis.

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