Download or read book Study of natural convection problem inside a cubical cavity from the point of view of dynamical system written by Dolors Puigjaner i Riba and published by . This book was released on 2005 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Natural Convection Heat Transfer and Flow Field Inside a Cubical Cavity microform written by Mohammad Arif Hasan Mamun and published by National Library of Canada = Bibliothèque nationale du Canada. This book was released on 2003 with total page 374 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Natural Convection in a Square Cavity written by Graham De Vahl Davis and published by . This book was released on 1982 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NATURAL CONVECTION INSIDE A CIRCULAR CAVITY written by POA T. CHU and published by . This book was released on 1961 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nanofluid Flow in Porous Media written by Mohsen Sheikholeslami Kandelousi and published by BoD – Books on Demand. This book was released on 2020-08-19 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt: Studies of fluid flow and heat transfer in a porous medium have been the subject of continuous interest for the past several decades because of the wide range of applications, such as geothermal systems, drying technologies, production of thermal isolators, control of pollutant spread in groundwater, insulation of buildings, solar power collectors, design of nuclear reactors, and compact heat exchangers, etc. There are several models for simulating porous media such as the Darcy model, Non-Darcy model, and non-equilibrium model. In porous media applications, such as the environmental impact of buried nuclear heat-generating waste, chemical reactors, thermal energy transport/storage systems, the cooling of electronic devices, etc., a temperature discrepancy between the solid matrix and the saturating fluid has been observed and recognized.
Download or read book Study of Natural Convection Instabilities in Closed Cavities with Non isothermal Walls written by Sneha Rajeev Sondur and published by . This book was released on 2020 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt: Natural convection inside closed cavities has been investigated extensively over the years owing to its application in several industrial processes. Amongst these, the most commonly studied configuration is that of natural convection in air-filled cavities with isothermal vertical walls maintained at different temperatures, which promote a unicellular base air-flow pattern. In the present work, natural convection of air in annular and rectangular cavities with non-isothermal walls supporting a bi-cellular base air-flow pattern is explored both experimentally and numerically. The experiments and numerical studies described in this work represent a significant departure from the more familiar problem of stability of unicellular convection in closed cavities and are therefore a novel addition to the body of literature available for natural convection systems. Two experimental systems, one annular and one rectangular were constructed to study the stability of natural convection in tall, closed air-filled cavities with non-isothermal walls. The thermal boundary conditions applied on the cavities' vertical walls were such that the temperature of one vertical wall was higher than that of the opposing wall in the top portion of the cavity and lower than it in the bottom portion of the cavity. The Rayleigh number or buoyant potential of the bi-cellular (base) air-flow was successively increased/decreased over the course of several experiments, and the stability of flow inside these cavities was studied via monitoring of air temperatures. At low Rayleigh numbers, a steady flow regime was observed for both annular and rectangular cavities. With an increase in Rayleigh number transitions to 3D asymmetric periodic flows, quasi-periodic flows, intermittent flows, and chaotic flows were observed for the annular cavity. On the other hand, transitions from steady to 2D periodic flow, then to 3D periodic flow and finally to chaotic flow were observed for the rectangular cavity. The observed flow bifurcations, the resultant oscillation frequencies, phases, and amplitudes mapped relative to the wall thermal boundary conditions for both annular and rectangular experimental systems are presented in this work. 2D and 3D CFD models of the two experimental systems were developed using the commercial CFD code Simcenter StarCCM+ in order to numerically predict the experimentally observed unsteady natural convection flows. The experimentally imposed thermal boundary conditions were used as inputs for the CFD models. The accuracy of these CFD models in predicting experimental flows is discussed, and comparisons are made between the prediction capabilities of the 2D and 3D CFD models. Furthermore, the numerical simulations and frequency analysis of the experimental data are able to shed light on the primary instability modes causing the transitions from steady to unsteady flows. These instability mechanisms responsible for bifurcations observed in the annular and rectangular cavity are discussed in detail. This work also includes a benchmarking exercise for the commercial CFD code Simcenter StarCCM+ for problems of natural convection in cavities under both Boussinesq and non-Boussinesq temperature conditions. In addition, numerical simulations to understand the impact of non-Boussinesq temperature conditions and variable thermophysical fluid properties on the natural convection instabilities observed in closed, tall, air-filled rectangular and annular cavities with isothermal walls are performed.
Download or read book Mathematical Models of Convection written by Victor K. Andreev and published by Walter de Gruyter. This book was released on 2012-07-30 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt: Phenomena of convection are abundant in nature as well as in industry. This volume addresses the subject of convection from the point of view of both, theory and application. While the first three chapters provide a refresher on fluid dynamics and heat transfer theory, the rest of the book describes the modern developments in theory. Thus it brings the reader to the "front" of the modern research. This monograph provides the theoretical foundation on a topic relevant to metallurgy, ecology, meteorology, geo-and astrophysics, aerospace industry, chemistry, crystal physics, and many other fields.
Download or read book An Experimental Study of Flow Patterns and Heat Transfer by Natural Convection Inside Cubical Enclosures written by Yue-Shyang Lin and published by . This book was released on 1982 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Numerical Solutions for a Comparison Problem on Natural Convection in an Enclosed Cavity written by I. P. Jones and published by . This book was released on 1981 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Turbulent Natural Convection in a Differentially Heated Square Cavity written by Warit Chanprasert and published by . This book was released on 2018 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt: Natural convection in a side or differentially heated cavity is a classical problem in heat transfer. The problem represents a wide range of engineering applications and has also been commonly used as a benchmark problem for validating Computational Fluid Dynamics (CFD) computer programs. This study investigates turbulent natural convection of a fluid with a Prandtl number of 0.71 in a differentially heated square cavity with adiabatic top and bottom walls. Two different boundary conditions are applied to the side walls; (1) the standard isothermal side wall problem, and (2) the mixed isoflux/isothermal problem, which has a constant heat flux on the heated side wall with an isothermal cold wall on the opposite side. An experimental study is carried out to determine the net convective heat transfer between isothermal hot and cold walls for a range of wall temperature differences in the laminar flow regime. The experiment data is compared with CFD predictions, and they are found to be in reasonable agreement......
Download or read book Natural Convection in an Enclosed Cavity written by Institute for Computer Applications in Science and Engineering and published by . This book was released on 1983 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Numerical Solutions for a Comparison Problem on Natural Convection in an Enclosed Cavity written by I. P. Jones and published by . This book was released on 1981 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Numerical Study of Natural Convection in an Open Cavity written by V. Venkatakrishnan and published by . This book was released on 1983 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Experimental Study of Natural Convection in an Open Cavity written by Ioannis Kyriakides and published by . This book was released on 1981 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NATURAL CONVECTION INSIDE A HORIZONTAL CYLINDER written by WILLIAM R. MARTINI and published by . This book was released on 1956 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Rayleigh benard Convection Structures And Dynamics written by Alexander V Getling and published by World Scientific. This book was released on 1998-03-06 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: This invaluable book presents a concise but systematic account of the formation of spatial flow structures in a horizontal fluid layer heated from below. Flows of this type, known as Rayleigh-Bénard convection, show important features of behaviour inherent not only in various hydrodynamic-instability phenomena but also in nonlinear pattern-forming processes in other contexts. The book describes the basic methods of investigating convection patterns, and the types of two- and three-dimensional flows, pattern defects, and sequences of convection-regime changes.The author pays special attention to the question of how various factors (mainly reducible to initial and boundary conditions) determine the shapes and sizes of the structures which develop. In this way, the role of order and disorder in flow patterns, as a factor strongly affecting the character of the evolution of structures, is revealed. The presentation emphasizes the physical picture of these phenomena, without excessive mathematical detail.
Download or read book NATURAL CONVECTION IN CAVITIES WITH INTERNAL FINS written by SANKAR GANESH SUBRAMANIAN and published by LAP Lambert Academic Publishing. This book was released on 2010-11-30 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: A numerical study has been carried out in differentially heated square cavities, which are formed by horizontal adiabatic walls and vertical isothermal walls. Three cases such as Natural convection in a cavity without any fins, with one fin and with two fins each placed equidistant from the center on the hot wall have been considered. Heat transfer by natural convection is studied by numerically solving equations of continuity, momentum and energy. A parametric study is carried out using the following parameters: Rayleigh number from 104 to 107, Prandtl number of 0.729, internal fin length of 0.10 m. A total of 24 cases have been considered and plotted using Fluent.
