Transient free convective flow in a vertical channel with constant temperature and constant heat flux on walls

1996 ◽  
Vol 32 (1-2) ◽  
pp. 61-63 ◽  
Author(s):  
Trishna Paul ◽  
B. K. Jha ◽  
A. K. Singh
Keyword(s):  
Heat Flux ◽  
Constant Temperature ◽  
Convective Flow ◽  
Vertical Channel ◽  
Constant Heat Flux ◽  
Free Convective Flow ◽  
Constant Heat

Free convective flow on a vertical plate with a constant heat flux in the presence of one or more steps

1995 ◽  
Vol 67 (3-4) ◽  
pp. 848-853 ◽  
Author(s):  
V. S. Burak ◽  
S. V. Volkov ◽  
O. G. Martynenko ◽  
P. P. Khramtsov ◽  
I. A. Shikh
Keyword(s):  
Heat Flux ◽  
Convective Flow ◽  
Vertical Plate ◽  
Constant Heat Flux ◽  
Free Convective Flow ◽  
Constant Heat

Drying Corn Grains Contained in a Vertical Channel with Constant Heat Flux on Walls

2009 ◽  
Vol 27 (3) ◽  
pp. 459-466 ◽  
Author(s):  
J. Bathiebo ◽  
M. Daguenet ◽  
B. Zeghmati ◽  
M. Tolley ◽  
M. Fodé ◽  
...  
Keyword(s):  
Heat Flux ◽  
Vertical Channel ◽  
Constant Heat Flux ◽  
Constant Heat ◽  
Corn Grains

scholarly journals G-jitter fully developed heat transfer by mixed convection flow in a vertical channel with constant heat flux

2020 ◽  
Vol 16 (1) ◽  
pp. 105-108
Author(s):  
Wan Nor Zaleha Amin ◽  
Ahmad Qushairi Mohammad ◽  
Mohammed Abdulhameed ◽  
Sharidan Shafie
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Mixed Convection ◽  
Fourier Method ◽  
Vertical Channel ◽  
Constant Heat Flux ◽  
Convection Flow ◽  
Infinite Length ◽  
Fluid Temperature ◽  
Constant Heat

A theoretical study of mixed convection heat transfer was carried out in an infinite length of vertical channel with both open ends. One of the vertical plates was prescribed with constant heat flux. The effect of g-jitter was also taken into consideration. The Fourier method was utilized to solve the resulting governing equations. The behavior of the fluid temperature and velocity of the flow were studied and presented graphically in this paper. The graphical results were later on analyzed and discussed. The behavior of steady state flow was also investigated. Results confirmed that as wall temperature increased, the fluid temperature increased. The velocity increased due to increments in mixed convection and oscillation parameter, on the other hand, it decreased as a frequency of g-jitter increased. 

scholarly journals Convection Heat Transfer Analysis in A Vertical Porous Tube

2020 ◽  
Vol 8 (1) ◽  
pp. 31-45
Author(s):  
Hikmat N. Abdulkareem ◽  
Kifah H. Hilal
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Convection Heat Transfer ◽  
Particle Diameter ◽  
Vertical Channel ◽  
Packed Bed ◽  
Constant Heat Flux ◽  
Heat Transfer Analysis ◽  
Constant Heat ◽  
Flux Boundary Condition

Forced convective heat transfer in a vertical channel symmetrically heated with a constant heat flux, and packed with saturated porous media, has been investigated experimentally in the present work. The channel was padded with spherical glass of three diameter (1, 3 and 10 mm) in a range 0.0416 < (particle diameter / inner channel radius) <0.416. The experimental setup, using a copper tube as a packed bed assembly with (48 mm) inside diameter and (1150 mm) heated length with a constant heat flux boundary condition. The test section was vertically oriented with water flowing against gravity and packed with glass spheres (1, 3 and 10 mm) diameter respectively. The results show that local Nusselt number increased at 34% with increasing Reynolds number at 65% while increased at 11% with increasing heat flux at 71%. Heat transfer rate increase as the particle diameter increase at the range of (1 – 3) mm but decrease with increasing particle diameter at the range (3 – 10) mm. Pressure drop through channel minimize at 97% as porosity increase at 23%.Many empirical relations, obtained experimentally.

Defining a Discretized Space Suit Surface Radiator With Variable Emissivity Properties

2015 ◽  
Vol 7 (4) ◽  
Author(s):  
Christopher J. Massina ◽  
David M. Klaus
Keyword(s):  
Heat Flux ◽  
Constant Temperature ◽  
Thermal Control ◽  
Constant Heat Flux ◽  
Order Estimate ◽  
Space Suit ◽  
Constant Heat ◽  
Load Range ◽  
Heat Rejection ◽  
Integration Architecture

Heat rejection for space suit thermal control is typically achieved by sublimating water ice to vacuum. Converting the majority of a space suit's surface area into a radiator may offer an alternative means of heat rejection, thus reducing the undesirable loss of water mass to space. In this work, variable infrared (IR) emissivity electrochromic materials are considered and analyzed as a mechanism to actively modulate radiative heat rejection in the proposed full suit radiator architecture. A simplified suit geometry and lunar pole thermal environment is used to provide a first-order estimate of electrochromic performance requirements, including number of individually controllable pixels and the emissivity variation that they must be able to achieve to enable this application. In addition to several implementation considerations, two fundamental integration architecture options are presented—constant temperature and constant heat flux. With constant temperature integration, up to 48 individual pixels with an achievable emissivity range of 0.169–0.495 could be used to reject a metabolic load range of 100 W–500 W. Alternatively, with constant heat flux integration, approximately 400 pixels with an achievable emissivity range of 0.122–0.967 are required to reject the same load range in an identical external environment. Overall, the use of variable emissivity electrochromics in this capacity is shown to offer a potentially feasible solution to approach zero consumable loss thermal control in space suits.

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