Improvement of Forced Convection Cooling Due to the Attachment of Heat Sources to a Conducting Thick Plate

2013 ◽  
Vol 135 (12) ◽  
Author(s):  
Mohammad Reza Hajmohammadi ◽  
Antonio Campo ◽  
S. Salman Nourazar ◽  
Amir Masood Ostad
Keyword(s):  
Forced Convection ◽  
Thick Plate ◽  
Plate Thickness ◽  
Heat Current ◽  
Heat Sources ◽  
Excess Temperature ◽  
Optimal Thickness ◽  
Numerical Work ◽  
Flowing Fluid ◽  
Convection Cooling

It is proposed that a conductive thick plate is placed between a heat source and a cold flowing fluid to improve the forced convection cooling performance. Detailed numerical work is carried out to determine the optimal thickness of the conductive thick plate which minimizes the peak temperature. It is shown that the thick plate significantly reduces the excess temperature of heat sources, by way of conducting the heat current in an optimal manner. It is shown that the reduction in the excess temperature of heat sources depends upon the Reynolds number of the fluid flow and the material thermal conductivity. Correlations for the optimum plate thickness and reduction in excess temperature of heat sources are presented, which could be useful for the practitioners.

Prediction of Deformation to Thin Ship Panels for Different Heat Sources

2001 ◽  
Vol 17 (02) ◽  
pp. 52-61
Author(s):  
H.C. Kuo ◽  
L.J. Wu
Keyword(s):  
Plate Thickness ◽  
Prediction Method ◽  
Steel Plates ◽  
Data Series ◽  
Heat Sources ◽  
Skilled Workers ◽  
Forming Process ◽  
Shipbuilding Industry ◽  
On Line ◽  
The Moment

The increasing use of thin steel plates in manufacturing and the shipbuilding industry has given rise to several issues: massive deformation problems, the need for many skilled workers, and the expense of costs for straightening in on-line processes. This study explains the results of experiments and predicts techniques for the control of deformation in thin panels. The objective of this paper is to explain the use of the G(1,1) Grey method to predict deformation. Bending and buckling are usually the dominant modes of deformation in heat working. It follows angular deformation. De- formation due to different heat sources is discussed. In this paper, laser and torch are used in different constraints, for example, free-free beam and cantilever beam. Many important factors include tiny adjustments during the heat forming process, such as changing the moment speed, intensity of input heating, plate thickness and heating path, to improve manufacture techniques and to predict deformation by data series. For the prediction of deformation, a method to estimate input heating of laser and torch is introduced. The proposed prediction method can be used during the forming process simply and efficiently.

Study of the optimal layout of cooling fins in forced convection cooling

2002 ◽  
Vol 42 (7) ◽  
pp. 1101-1111 ◽  
Author(s):  
Octavio Leon ◽  
Gilbert De Mey ◽  
Erik Dick
Keyword(s):  
Forced Convection ◽  
Optimal Layout ◽  
Convection Cooling

Constructal Theory of the Minimum Requirements for Forced Convection Cooling Solutions

2005 ◽  
Author(s):  
E. J. Walsh ◽  
R. Grimes
Keyword(s):  
Forced Convection ◽  
Constructal Theory ◽  
Short Paper ◽  
The Past ◽  
Minimum Requirements ◽  
Convection Cooling ◽  
Cooling Technology ◽  
Level Of Understanding ◽  
Forced Cooling ◽  
Minimum Velocity

The advances in microfluidics and microelectronics bring with them the need to provide new cooling solutions for many applications. A number of technologies are under development for forced convection cooling at the microscale. This short paper, through the new constructal theory of Bejan, presents the minimum velocity requirements of any such technology to be truly useful in a new design. Thus the theory presented in this paper, should form the first step in the design process of any new forced cooling technology for mini-micro scale applications. Furthermore, it is demonstrated that the use of the constructal theory provides a heightened level of understanding to the problem of forced convection, while simultaneously deriving the empirical correlations proposed in the literature over the past number of decades.

Design Parameters and Practical Considerations in the Two-Phase Forced-Convection Cooling of Multi-Chip Modules

1992 ◽  
Vol 114 (3) ◽  
pp. 280-289 ◽  
Author(s):  
Christopher O. Gersey ◽  
Thomas C. Willingham ◽  
Issam Mudawar
Keyword(s):  
Forced Convection ◽  
Flow Rate ◽  
Rectangular Channel ◽  
Nucleate Boiling ◽  
Design Parameters ◽  
Two Phase ◽  
Chip Surface ◽  
Flow Area ◽  
Convection Cooling ◽  
Two Phase Cooling

Forced-convection boiling was investigated with a dielectric coolant (FC-72) in order to address some of the practical issues related to the two-phase cooling of multi-chip modules. The module used in the present study featured a linear array of nine, 10 × 10 mm2, simulated microelectronic chips which were flush-mounted along a 20-mm wide side of a rectangular channel. Experiments were performed with a 5-mm channel gap (distance between the chip surface and the opposing channel wall) at eight orientations spaced 45 degrees apart. Two other channel gaps, 2 and 10 mm, were tested in the vertical up flow configuration. For all these configurations, the velocity and subcooling of the liquid were varied from 13 to 400 cm/s and 3 to 36°C, respectively. Changes in orientation did not affect single-phase or nucleate boiling characteristics, but did have a major impact on CHF. Upflow conditions were found to be the best configuration for the design of two-phase cooling modules because of its inherently stable flow and relatively high CHF values. The CHF value for the most upstream chip in vertical upflow agreed well with a previous correlation for an isolated chip. Combined with the relatively small spread in CHF values for all chips in the array, this correlation was found to be attractive for design purposes in predicting CHF for a multi-chip array. To achieve a given CHF value, it is shown how the strong CHF dependence on velocity rather than flow area allows for a reduction in the required flow rate with the 2-mm, as compared to the 5-mm gap, which also required a smaller flow rate than the 10-mm gap. This reduction inflow rate was significant only with subcooled conditions corresponding to high CHF values.

Forced Convection Laminar Pulsating Flow in a 90-deg Bifurcation

2020 ◽  
Vol 13 (3) ◽  
Author(s):  
Fatih Selimefendigil ◽  
Hakan F. Öztop ◽  
Jay M. Khodadadi
Keyword(s):  
Heat Transfer ◽  
Reynolds Number ◽  
Forced Convection ◽  
Pulsating Flow ◽  
Working Fluid ◽  
Constant Wall Temperature ◽  
Numerical Work ◽  
Average Value ◽  
Number Variation ◽  
Volume Method

Abstract Numerical investigation of laminar forced convection of pulsating flow in a 90-deg bifurcation was performed with the finite volume method. The inlet velocity varies sinusoidally with time while constant wall temperature is utilized. The working fluid is air with constant properties and the numerical work is conducted for a range of the Reynolds numbers (100–2000), dividing flowrates (0.3–0.7) and Strouhal numbers (0.1–10). It is observed that the amplitudes of oscillating heat transfer are damped as the value of the Strouhal number increases. The average value of Nu number rises for higher Reynolds number and the dividing flowrate for the downstream wall of the y-channel branch. As the value of the dividing flowrate increases from 0.3 to 0.7, heat transfer is less effective in the vicinity of the branch at the Reynolds number of 500. The effects of the Reynolds number on the average Nu number variation is more pronounced for the y-branch wall for different values of dividing flowrates. Resonant type behavior of average Nu number is obtained for the y-branch channel for diving flowrates of 0.3 and 0.5.

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