Comprehensive assessment of viscous heat generation in rarefied gas microflows

2021 ◽  
Author(s):  
Nam T. P. Le ◽  
Bang V. Dinh ◽  
Quang L. Dang ◽  
Anh V. Dang ◽  
Y. Q. Nguyen
Keyword(s):  
Heat Generation ◽  
Rarefied Gas ◽  
Comprehensive Assessment ◽  
Viscous Heat ◽  
Gas Microflows

Influence of Thermal Conductivity of Lubricant on the THD Characteristics of a Plain Journal Bearing

1991 ◽  
Author(s):  
C. Rajalingham ◽  
B. S. Prabhu ◽  
R. B. Bhat ◽  
G. D. Xistris
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Temperature Variation ◽  
Heat Generation ◽  
Journal Bearing ◽  
Lubricant Film ◽  
Fluid Film ◽  
Adiabatic Conditions ◽  
Viscous Heat ◽  
Hydrodynamic Journal Bearing

Abstract The viscous heat generation in the lubricant film of a hydrodynamic journal bearing causes a rise in temperature of the fluid film. Considering the influence of the temperature variation along and across the film, the performance of a journal bearing is investigated under adiabatic conditions for different values of thermal conductivity of the lubricant. In this analysis, the temperature of the journal surface has been chosen to ensure that there is no net heat transfer from the lubricant The results show that the variation of temperature across the film affects bearing performance significantly and that an increase in lubricant thermal conductivity enhances bearing performance.

Heat transfer to power-law fluids flowing in pipes and flat ducts with viscous heat generation

1991 ◽  
Vol 46 (5-6) ◽  
pp. 1385-1392 ◽  
Author(s):  
A.F. Flores ◽  
J.C. Gottifredi ◽  
G.V. Morales ◽  
O.D. Quiroga
Keyword(s):  
Heat Transfer ◽  
Heat Generation ◽  
Power Law ◽  
Viscous Heat ◽  
Power Law Fluids

scholarly journals Fluid transportation and heat transfer analysis of PP/TiO2 nanocomposites in an internal mixer

2019 ◽  
Vol 11 (1) ◽  
pp. 168781401881306
Author(s):  
XZ Zhu ◽  
J Liu ◽  
DP Sun
Keyword(s):  
Heat Transfer ◽  
Viscous Dissipation ◽  
Structure Analysis ◽  
Heat Generation ◽  
Coherent Structure ◽  
Heat Transfer Analysis ◽  
Heat Transfer Characteristics ◽  
Lagrangian Coherent Structure ◽  
Viscous Heat ◽  
Internal Mixer

The internal mixer is an important devise for processing the polymer nanocomposites acting as a chemical reactor. In this article, based on the computational fluid dynamics method, the fluid transportation and heat transfer analysis of sol–gel reaction processing for Polypropylene (PP)/TiO2 nanocomposites in the internal batch mixers with single-winged and two-winged Cam rotors were simulated. First, the Lagrangian coherent structure analysis was used to understand the fluid transport properties in the mixers. Then the effect of rotational speeds (ratios) and barrel temperatures on the heat transfer characteristics in the mixers with different rotors was analyzed. Also, the changes of viscous heating and torques of rotors with different thermal conditions in the mixers were discussed. Especially, the relationship between the fluid transportation and heat transfer characteristics was explored. The results show that a big rotor speed ratio can induce great fluid transportation in the left and right mixer chambers based on the Lagrangian coherent structure analysis, and the fluid near the horseshoe map has great folding effect and temperature magnitude. The viscous dissipation, viscous heat generation, and rotor torques in the mixers increase with increasing the rotational speeds and decrease with increasing the barrel temperatures. The mixer with two-winged rotors has higher average temperature, viscous dissipation, viscous heat generation and the torques of rotors values of reactive fluid than that with single-winged rotors.

New Type of Smoluchowski Temperature Jump Condition Considering the Viscous Heat Generation

AIAA Journal ◽  
2017 ◽  
Vol 55 (2) ◽  
pp. 474-483 ◽  
Author(s):  
Nam T. P. Le ◽  
Ngoc Anh Vu ◽  
Le Tan Loc
Keyword(s):  
Heat Generation ◽  
Temperature Jump ◽  
Jump Condition ◽  
Viscous Heat ◽  
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