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Author: A. Gadgil Publisher: ISBN: Category : Languages : en Pages : 16
Book Description
The present paper describes a verification of CONVEC2 for single-zone geometries by comparison with the results of two natural convection experiments performed in small-scale rectangular enclosures. These experiments were selected because of the high Rayleigh numbers obtained and the small heat loss through the insulated surfaces. Comparisons are presented for (1) heat transfer rates, (2) fluid temperature profiles, and (3) surface heat flux distributions.
Author: A. Gadgil Publisher: ISBN: Category : Languages : en Pages : 16
Book Description
The present paper describes a verification of CONVEC2 for single-zone geometries by comparison with the results of two natural convection experiments performed in small-scale rectangular enclosures. These experiments were selected because of the high Rayleigh numbers obtained and the small heat loss through the insulated surfaces. Comparisons are presented for (1) heat transfer rates, (2) fluid temperature profiles, and (3) surface heat flux distributions.
Author: A. Gadgil Publisher: ISBN: Category : Languages : en Pages : 16
Book Description
The present paper describes a verification of CONVEC2 for single-zone geometries by comparison with the results of two natural convection experiments performed in small-scale rectangular enclosures. These experiments were selected because of the high Rayleigh numbers obtained and the small heat loss through the insulated surfaces. Comparisons are presented for (1) heat transfer rates, (2) fluid temperature profiles, and (3) surface heat flux distributions.
Author: Hesham Khalil Publisher: Fluent Tutorials ISBN: 9781798498675 Category : Education Languages : en Pages : 98
Book Description
Natural convection is a phenomenon occurs when heat is transferred to a fluid, which raises its temperature and decreases its density and consequently makes it flows upward. This book is a complete tutorial on how to simulate this kind of phenomenon using ANSYS Fluent 19.2. This is applied to a simple application of cooling a small surface using a heat sink. The tutorial starts with creating the 3D domain itself inside ANSYS DesignModeler, then discretizing it (Meshing) in ANSYS Meshing application. After that, the model is defined in Fluent with the appropriate boundary conditions. Finally, the output data is processed in Fluent to see the resulting flow around the heat sink and the temperature distribution in both the fluid and the heat sink itself.This a tutorial for the complete steps required to complete this kind of simulation. It is presented in the form of high-resolution screenshots of the applications' windows which are preceded by a textual description of the steps. Also, some of these screenshots are followed by an explanation of the different choices when seen appropriate.
Author: Raluca Moglan Publisher: ISBN: Category : Languages : en Pages : 157
Book Description
In this thesis we present a new 3D approach for solving the incompressible Navier-Stokes equations under the Boussinesq approximation. The advantage of the developed numerical code is the use of high order methods for time integration (3rd order Runge-Kutta method) and spatial discretization (6th order finite difference schemes). A study of the order of the numerical method was made, followed by an extensive validation for several cases of natural convection. A finite element simulation code for the same problem was developed using FreeFem++, and was validated with respect to the same cases of natural convection. The case of a telecommunication cabinet was treated by modelling interior obstacles generating heat using an immersed boundary method. This method was validated with respect to the finite element simulation, and many other cases from the literature. We present the results for different 2D and 3D configurations, with obstacles differently placed inside the cavity. Results are also presented for the comparison with experimental measurements in a cabinet with two components dissipating heat. The finite element code is finally extended and tested to simulate phase change materials that could serve as passive cooling devices.
Author: Mehran Ahmadi Publisher: ISBN: Category : Languages : en Pages : 86
Book Description
This research, which has been done in close collaboration with industrial partners, Alpha Technologies and Analytic Systems companies, aims to push the current limits of natural convection heat transfer from vertical heatsinks, with application in passive thermal management of electronics and power electronics. Advantages such as; being noise-free, reliable, with no parasitic power demand, and less maintenance requirements, make passive cooling a preferred thermal management solution for electronics. The focus of this thesis is to design high performance naturally-cooled heatsinks, to increase the cooling capacity of available passive thermal management systems. Heatsinks with interrupted rectangular vertical fins are the target of this study. Due to the complexities associated with interrupted fins, interrupted rectangular single wall is chosen as the starting point of the project. Asymptotic solution and blending technique is used to present a compact correlation for average Nusselt number of such wall, for the first time. The proposed correlation is verified by the results obtained from numerical simulations, and experimental data obtained from a custom-designed testbed. In the next step, natural convection heat transfer from parallel plates has been investigated. Integral technique is used to solve the governing equations, and closed-form correlations for velocity, temperature, and local Nusselt number are developed for the first time. The results are successfully verified with the result of an independent numerical simulation and experimental data obtained from the tests conducted on heatsink sample. In the last step, to model heat transfer from interrupted finned heatsinks, and to obtain compact correlations for velocity and temperature inside the domain, an analytical approach is used. Numerical simulations are performed to provide the information required by our analytical approach. An extensive experimental study is also conducted to verify the results from analytical solution and numerical simulation. Results show that the new-designed heatsinks are capable of dissipating heat five times more than currently available naturally-cooled heatsinks, with a weight up to 30% less. The new heatsinks can increase the capacity of passive-cooled systems significantly.
Author: A. Gadgil
Author: A. Gadgil
Author: A. Gadgil
Author: 
Author: Hesham Khalil
Author: Graham De Vahl Davis
Author: Raluca Moglan
Author: D. Brian Spalding![Numerical Simulation of Natural Convection in Cavities Using the Finite Analytic Method [microform] PDF](https://books.google.com/books/content/images/frontcover/J3epNwAACAAJ?fife=w80-h100)
Author: Mehrdad Rahdar
Author: Mehran Ahmadi
Author: G. Lauriat