Convective heat-transfer equation in the entrance section of an annular channel

1985 ◽  
Vol 49 (1) ◽  
pp. 768-772
Author(s):  
V. A. Korablev ◽  
A. V. Sharkov
Keyword(s):  
Heat Transfer ◽  
Convective Heat Transfer ◽  
Convective Heat ◽  
Transfer Equation ◽  
Annular Channel ◽  
Heat Transfer Equation ◽  
Entrance Section

scholarly journals Temperature distribution in the three-layered upper mantle beneath a continent

2021 ◽  
Vol 2119 (1) ◽  
pp. 012006
Author(s):  
A G Kirdyashkin ◽  
A A Kirdyashkin ◽  
A V Borodin ◽  
V S Kolmakov
Keyword(s):  
Heat Transfer ◽  
Temperature Distribution ◽  
Convective Heat Transfer ◽  
Upper Mantle ◽  
Lower Mantle ◽  
Transfer Equation ◽  
Horizontal Layer ◽  
Heat Transfer Equation ◽  
Continental Lithosphere ◽  
Conduction Heat Transfer

Abstract Temperature distribution in the upper mantle underneath the continent, as well as temperature distribution in the lower mantle, is obtained. In the continental lithosphere, the solution to the heat transfer equation is obtained in the model of conduction heat transfer with inner heat within the crust. To calculate the temperature distribution in the upper and lower mantle, we use the results of laboratory and theoretical modeling of free convective heat transfer in a horizontal layer heated from below and cooled from above.

Numerical Simulations of Natural Convective Heat Transfer in Vertical Concentric and Eccentric Annular Channels

2018 ◽  
Vol 140 (10) ◽  
Author(s):  
A. A. Busedra ◽  
S. Tavoularis
Keyword(s):  
Heat Transfer ◽  
Convective Heat Transfer ◽  
Mass Flow Rate ◽  
Convective Heat ◽  
Mass Flow ◽  
Flow Rate ◽  
Annular Channel ◽  
Diameter Ratio ◽  
Fluid Temperature ◽  
Annular Channels

Natural convective heat transfer in a concentric and a highly eccentric, vertical, open ended, annular channel has been investigated numerically. The inner to outer diameter ratio was 0.61, and the height to hydraulic diameter ratio was 18:1. Three heating modes were considered, all having uniform heat flux applied to one or both of the two walls, while the unheated wall was kept adiabatic. The wall temperature distribution, mass flow rate, and midchannel Nusselt number for the case with both walls heated were found to be in excellent agreement with available experimental results. For the same heating conditions, the heat transfer rate in the concentric annular channel was found to be greater than that in the highly eccentric channel, while the mass flow rate was higher in the eccentric channel. A novel finding for the eccentric channel was that the location of maximum velocity was intermediate between the narrow and wide gaps. Another novel observation, which was attributed to radiation effects, was that the fluid temperature in the wide gap region was lower than that of an adiabatic wall. The paper contains additional observations that would be of interest to designers of systems containing annular channels.

Convective Heat Transfer to CO2 at a Supercritical Pressure Flowing Vertically Upward in Tubes and an Annulus Channel

2008 ◽  
Author(s):  
Yoon-Yeong Bae ◽  
Hwan-Yeol Kim ◽  
Deog-Ji Kang
Keyword(s):  
Heat Transfer ◽  
Convective Heat Transfer ◽  
Convective Heat ◽  
Annular Channel ◽  
Supercritical Pressure ◽  
Internal Diameter ◽  
Test Results ◽  
Annular Channels ◽  
Normal Heat

Extensive experiments on heat transfer at a supercritical pressure to CO2 in tubes and annular channels have been performed. The geometries of the test sections include tubes of an internal diameter of 4.4 and 9 mm and an annular channel (8 × 10 mm). Based on the test results a set of correlations, which covers a deteriorated heat transfer regime as well as a normal heat transfer regime, was developed.

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