Document Details

Document Type : Thesis 
Document Title :
NUMERICAL STUDY OF EFFECT OF THERMO PHYSICAL PROPERTIES ON HEAT TRANSFER OF FLUID FLOWS THROUGH MICRO DUCTS
دراسة عددية لتأثير الخواص الحرارية على الانتقال الحراري للسريان في القنوات الدقيقة
 
Subject : Faculty of Engineering 
Document Language : Arabic 
Abstract : Micro-channels, with their high surface area to volume ratio, have high heat dissipation capacity and thus play an important role in micro-electro-mechanical systems and electronic devices. In micropipes,the axial conduction and radial convection influences the heat flow and hydrodynamic characteristics, apart from the radial conduction, axial convection and viscous dissipation. The axial convection, radial convection and viscous dissipation effects are one of the reasons for differences in convective heat transfer flow characteristics between conventional and micro-pipes. The variations of fluid properties in micro-convection are much stronger due to steeper temperature gradients and hence its role is significant. The other reasons being scaling effects, such as rarefaction are neglected in the present work. The present work investigates the influence of property variations, density ρ(T), dynamic viscosity μ(T), thermal conductivity k(T) and specific heat at constant pressure Cp(T) on microconvective laminar flow characteristics with entrance affects. The direct effects due to the variations of heat transfer and fluid-flow parameters, ρ(T), and μ(T), affect the velocity and temperature gradient near the wall region. The indirect effects due to the variations of fluid-thermal parameters, Cp(T) and k(T) affect the temperature field, hence ρ(T), and μ(T), are affected. Numerical simulations are performed for forced convective fluid flows through two-dimensional axisymmetric micro-pipe to predict the flow behavior and thermal development using different fluids like water, engine oil, and air. The conservation equations for pipe-flows are solved in the pure continuum regime to reach the steady state solution. These fluid flows are simulated at different diameters and inlet velocities, and at two different boundary conditions. The two boundary conditions of constant wall heat flux rate and constant wall temperature are assumed. 
Supervisor : Dr.. Amjad Ali Pasha 
Thesis Type : Master Thesis 
Publishing Year : 1438 AH
2017 AD 
Co-Supervisor : Dr.. Khaled Ahmed Al - Jahni 
Added Date : Tuesday, July 18, 2017 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
عبد المشتاق عابد حسينHussein, Abdul Mashtaq AbedResearcherMaster 

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 42101.pdf pdf 

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