Numerical study of mixed convection for laminar flow inside a vented cavity
Other Title(s)
دراسة عددية بالحمل المختلط للجريان الطباقي داخل فجوة مفتوحة
Dissertant
Thesis advisor
Abbud, Falah Asi
Muhammad, Ahmad K.
Comitee Members
Rishack, Qays A.
Munim, Ali A.
al-Musawy, Adil A.
University
University of Basrah
Faculty
Engineering College
Department
Department of Mechanical Engineering
University Country
Iraq
Degree
Master
Degree Date
2012
English Abstract
In this study the performance of mixed convection in a square, trapezoidal and triangular cavities is studied numerically.
Hydrodynamics and heat transfer characteristics in a laminar, 2-D, incompressible and steady state flow are considered.
An external air flow enters the cavity through an opening in the left vertical wall for rectangular and trapezoidal cavities, and in the inclined wall for triangular enclosure and exits from another opening in the right vertical wall.
The wall of the cavity is kept constant temperature for all cases, case (1) : heated on the bottom wall, case (2) : heated on the right vertical wall for three configurations (square, trapezoidal and triangular geometries), case (3) : heated on the bottom and the vertical walls for triangular geometry and case (4): heated on the inclined wall for triangular geometry, while the other walls are adiabatic.
The Navier-Stokes equations (momentum equations) and energy equation are solved by using Galerkin method based on the control finite element method with using two programs: Fortran power station program to compute the local Nusselt number, the distribution of local velocity of flow and temperature field with different axial position (0.25, 0.5, 0.75) and to know thickness of thermal boundary layer for case (1), and software package (Flexpde) program.
Results of streamlines, isotherms , average temperature and averaged Nusselt number of the heated wall are presented for Ri number values of 0, 1 and 10 and Re values of 50, 100 and 200 and Pr = 0.71.
Also the results are reported for case(1) in terms of aspect ratio (0.1 ≤ AR ≤ 1) and different outlet positions HO = 0 , 0.45 and 0.9, and the type of inlet port.
The obtained results showed that the heat transfer rate increases with increasing of Reynolds number, Richardson number and aspect ratio.
The heat transfer process enhances when the external flow is horizontal and not inclined.
As it is observed that the rate of heat transfer from the heated wall depends significantly on the position of the outlet port.
The results of streamlines, isotherms and average temperature are compared with available result of Rahman et al.
[25], an excellent agreement has been achieved.
Main Subjects
Topics
No. of Pages
136
Table of Contents
Table of contents.
Abstract.
Chapter One : introduction.
Chapter Two : literature review.
Chapter Three : theoretical analysis.
Chapter Four : results and discussion.
Chapter Five : conclusions and recommendations.
References.
American Psychological Association (APA)
al-Kikhany, Miqdad Yasir Abd. (2012). Numerical study of mixed convection for laminar flow inside a vented cavity. (Master's theses Theses and Dissertations Master). University of Basrah, Iraq
https://search.emarefa.net/detail/BIM-317166
Modern Language Association (MLA)
al-Kikhany, Miqdad Yasir Abd. Numerical study of mixed convection for laminar flow inside a vented cavity. (Master's theses Theses and Dissertations Master). University of Basrah. (2012).
https://search.emarefa.net/detail/BIM-317166
American Medical Association (AMA)
al-Kikhany, Miqdad Yasir Abd. (2012). Numerical study of mixed convection for laminar flow inside a vented cavity. (Master's theses Theses and Dissertations Master). University of Basrah, Iraq
https://search.emarefa.net/detail/BIM-317166
Language
English
Data Type
Arab Theses
Record ID
BIM-317166