The Influence of Wall Conductance on Magnetohydrodynamic Channel-Flow Heat Transfer

1964 ◽  
Vol 86 (4) ◽  
pp. 552-556 ◽  
Author(s):  
W. T. Snyder
Keyword(s):  
Heat Transfer ◽  
Electrical Conductivity ◽  
Channel Flow ◽  
Operating Conditions ◽  
Modes Of Operation ◽  
Electrical Loading ◽  
Finite Electrical Conductivity ◽  
Flow Heat ◽  
Magnetohydrodynamic Channel ◽  
Accelerator Modes

An analysis is made of the influence of finite electrical conductivity of the walls on fully developed magnetohydrodynamic channel-flow heat transfer. The analysis is based on arbitrary external electrical loading and is thus valid for both generator and accelerator modes of operation. Constant properties of the fluid and walls are assumed. It is shown that under certain operating conditions of external electrical loading, the fluid bulk to wall temperature difference for conducting walls differs substantially from that for electrically insulating walls. Representative numerical calculations are presented.

scholarly journals A variational principle for magnetohydrodynamic channel flow

1970 ◽  
Vol 43 (1) ◽  
pp. 211-224 ◽  
Author(s):  
Norman C. Wenger
Keyword(s):  
Channel Flow ◽  
Variational Formulation ◽  
Fluid Velocity ◽  
Channel Cross Section ◽  
Mhd Generator ◽  
Square Channel ◽  
Flow Problems ◽  
Finite Electrical Conductivity ◽  
Magnetohydrodynamic Channel ◽  
Mhd Channel

A variational formulation is presented for a class of magnetohydrodynamic (MHD) channel flow problems. This formulation yields solutions for the fluid velocity and the induced electric potential in a channel with a uniform transverse static magnetic field. The channel cross-section is constant but arbitrary, and the channel walls can be either insulators or conductors with finite electrical conductivity. Electric currents are permitted to enter and leave the channel walls so that the solutions are suitable for MHD generator and pump applications. An example of a square channel with conducting walls is solved as an illustration.

Heat Transfer Characteristics of Baffled Channel Flow

2011 ◽  
Author(s):  
Changwoo Kang ◽  
Kyung-Soo Yang
Keyword(s):  
Heat Transfer ◽  
Channel Flow ◽  
Large Scale ◽  
Heat Removal ◽  
Heat Transfer Characteristics ◽  
Transfer Characteristics ◽  
Flow Heat ◽  
Two Parameters ◽  
Time Periodic

Heat transfer characteristics of baffled channel flow, where thin baffles are mounted on both channel walls periodically in the direction of the main flow, have been numerically investigated in a laminar range. In baffled channel flow, heat transfer characteristics are significantly affected by large-scale vortices generated due to flow separation at the tips of the baffles. In this investigation, a parametric study has been carried out to identify the optimal configuration of the baffles to achieve the most efficient heat removal from the channel walls. Two key parameters are considered, namely baffle interval (L) and Reynolds number (Re). We elucidate the role of the primary instability, a Hopf bifurcation from steady to a time-periodic flow, in the convective heat transfer in baffled channel flow. We also propose a contour diagram (“map”) of averaged Nusselt number on the channel walls as a function of the two parameters. The results shed light on understanding and controlling heat transfer mechanism in a finned heat exchanger, being quite beneficial to its design.

scholarly journals Performance of Pure Crossflow Heat Exchanger in Sensible Heat Transfer Application

Energies ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 5489
Author(s):  
Karthik Silaipillayarputhur ◽  
Tawfiq Al-Mughanam
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Research Work ◽  
Cross Flow ◽  
Operating Conditions ◽  
Sensible Heat ◽  
Process Industries ◽  
Flow Heat ◽  
And Performance ◽  
Marginal Improvement

All process industries involve the usage of heat exchanger equipment and understanding its performance during the design phase is very essential. The present research work specifies the performance of a pure cross flow heat exchanger in terms of dimensionless factors such as number of transfer units, capacity rate ratio, and heat exchanger effectiveness. Steady state sensible heat transfer was considered in the analysis. The matrix approach that was established in the earlier work was used in the study. The results were depicted in the form of charts, tables, and performance equations. It was observed that indeterminately increasing the number of transfer units past a threshold limit provided very marginal improvement in the performance of a pure cross flow heat exchanger. Likewise, flow pattern in a heat exchanger is usually assumed either as mixed or unmixed. However, due to various operating conditions, partially mixed conditions do exist. This work considers partially mixed conditions in the tube side of the heat exchanger. The correction factor for heat exchanger effectiveness was developed to accommodate partially mixed flow conditions in the pure cross flow heat exchanger.

scholarly journals Modes of Circulation in an Inverted U-Tube Array With Condensation

1982 ◽  
Vol 104 (4) ◽  
pp. 769-773 ◽  
Author(s):  
C. Calia ◽  
P. Griffith
Keyword(s):  
Heat Transfer ◽  
Steam Generator ◽  
Flow Rate ◽  
Pressure Difference ◽  
Operating Conditions ◽  
Steam Generators ◽  
Modes Of Operation ◽  
Glass Tubes ◽  
Abnormal Operating Conditions ◽  
Plenum Pressure

An experiment and analysis was performed on an inverted U-tube steam condenser (similar to a steam generator) to determine the modes of flow that can exist as the rate of steam flow into the condenser is reduced. The condenser consisted of four glass tubes connected to a common inlet plenum and a common exit plenum. Heat-transfer and flow-rate measurements, as well as visual observations were made. Four different modes of operation were identified. Noncondensables were found to substantially alter the plenum to plenum pressure difference and aid flow stability. Satisfactory analytical descriptions of the observations have been developed as well as application of the results to the condensing behavior of nuclear steam generators under abnormal operating conditions.

Effect of Rib Profiles on Turbulent Channel Flow Heat Transfer

1998 ◽  
Vol 12 (1) ◽  
pp. 116-118 ◽  
Author(s):  
Pankaj R. Chandra ◽  
Michael L. Fontenot ◽  
Je-Chin Han
Keyword(s):  
Heat Transfer ◽  
Channel Flow ◽  
Turbulent Channel Flow ◽  
Flow Heat
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