Journal ArticleDOI
Heat Transfer Analysis of Digital Transmission Equipment with Horizontally Arranged Printed Circuit Boards
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TLDR
In this paper, the steady-state thermal dissipation in the thermal unit of a printed circuit board (PCB) made of the slim rack is investigated by assuming isothermal enclosure surfaces with uniform radiosities.Abstract:
Printed circuit boards (PCBs) may be arranged horizontally in many situations, as for example in some digital transmission equipment being used in Brazil Such pieces of equipment, known as slim racks, have a high aspect ratio (height/width) and are assembled side by side and back to back The present work deals with the steady-state thermal dissipation in the so-called thermal unit of the slim rack made of the PCB, the magnetic shield above it and the bounding walls constituting an enclosure The heat transfer in each thermal unit was investigated by assuming isothermal enclosure surfaces with uniform radiosities Once the thermal paths are identified, an electric circuit analogy is employed to obtain the overall thermal resistance network Most of the thermal resistances are temperature-dependent, so the associated nonlinear algebraic equations can be solved only by an iterative method An experimental investigation was carried out in a module of the slim rack with simplified boundary conditions in orderead more
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Combined Conduction, Natural Convection, and Radiation Heat Transfer in an Electronic Chassis
TL;DR: In this paper, a numerical study of the combined heat transfer by conduction, natural convection, and radiation in a sealed electronic package is reported, where the authors investigate the importance of the various heat transfer modes, the effectiveness of different heat transfer paths, and the impact of design changes on the overall thermal performance of a typical electronic package.
Journal ArticleDOI
Analysis of Entropy Generation Minimization during Natural Convection in Trapezoidal Enclosures of Various Angles with Linearly Heated Side Wall(s)
TL;DR: In this paper, the entropy generation in trapezoidal enclosures with various inclination angles (φ), φ = 45°, 60°, and 90° for uniformly heated bottom wall and insulated top wall with linearly heated side walls (case 1) or linearly heating left wall with cold right wall (case 2) have been investigated numerically using penalty finite element method.
Journal ArticleDOI
Natural convection heat transfer in enclosures fitted with a periodic array of hot roughness elements at the bottom
TL;DR: In this article, the authors investigated the natural convection heat transfer in a two-dimensional rectangular enclosure fitted with a periodic array of hot roughness elements at the bottom of the enclosure.
Journal ArticleDOI
Minimization of entropy generation due to MHD double diffusive mixed convection in a lid driven trapezoidal cavity with various aspect ratios
TL;DR: In this paper, the analysis of mixed convection fluid flow, heat and mass transfer with heat line and mass line concept and entropy generation in a trapezoidal enclosure with linearly heated and diffusive left wall, uniformly heated and diffuse lower wall, cold and nondiffusive right wall, adiabatic and zero diffusion gradient top wall have been reported.
References
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Book
Radiation Heat Transfer
TL;DR: In this article, the authors describe work which has been carried out under the subject grant during the period from April 1, 1961, to October 1, 2011, with technical supervision and guidance provided by Mr. Seymour Lieblein, Chief, Flow Physics Branch, NASA Lewis Research Center, Cleveland, Ohio.
Book
Thermal Analysis and Control of Electronic Equipment
Allan D. Kraus,Avram Bar-Cohen +1 more
TL;DR: In this article, thermal analysis and control of electronic equipment, thermal analysis of electronic devices and their control, thermal control and control in the field of software engineering, is discussed. ǫ
Journal ArticleDOI
Experiments on Heat Transfer From Spheres Including Combined Natural and Forced Convection
TL;DR: In this article, a graphical procedure was used to predict the heat transfer performance for combined natural and forced convection, based on experimental results, and compared with other investigations, including simulations.
Journal ArticleDOI
The Effect of Heater Size, Location, Aspect Ratio, and Boundary Conditions on Two-Dimensional, Laminar, Natural Convection in Rectangular Channels
TL;DR: In this paper, the effect of localized heating in rectangular channels was studied by solving the partial differential equations for the conservation of mass, momentum, and energy numerically using an unsteady state formulation and the alternating-direction-implicit method.