This experimentation investigates the local heat transfer characteristics of an impinging jet with the effects of cross flow. The jet is formed by a single round hole with a diameter of 0.25 inches, sharp edges and a length to diameter ratio of 4. For one combination of impingem…
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Developing nations require improved sanitation technology implementations to reach Millennium Development Goal 7-C. Unfortunately, to date, the goal does not look attainable by the 2015 deadline—2.5 billion lake access to improved sanitation. Pathogen resistance to disinfection …
This dissertation presents an experimental investigation and numerical simulations of fluid flow and heat transfer in microchannels to study the effects of surface-dominated, non-continuum, multi-scale and multi-physics effects. The experimental study is on the effects of rib-pa…
Heat transfer distributions are presented for a stationary three passage serpentine internal cooling channel for a range of engine representative Reynolds numbers. The spacing between the sidewalls of the serpentine passage is fixed and the aspect ratio (AR) is adjusted to 1:1, …
The problem of combined natural convection and radiation heat transfer of a gray absorbing-emitting and isotropically scattering medium in a triangular enclosure is solved numerically in this dissertation. Interactions of natural convection and radiation occur in many engineerin…
In this numerical and experimental study, three problems related to heat and mass transfer in porous media are examined. The first two deal with melting in a packed bed containing a mixture of particles having different melting points. It is demonstrated that through the applica…
Heat transfer from an inclined elliptic tube in a convective environment with fluctuations in the free stream velocity is investigated numerically including the effect of buoyancy forces. The free stream direction is horizontal and normal to the tube axis and the flow field is e…
An experimental study was made to obtain heat transfer data for two-pass square and rectangular channels with smooth and ribbed surfaces for two channel orientations (90° and 135° to the direction of rotational plane). In the two-pass square channel, ribs were placed on the lead…
Numerical prediction of three-dimensional flow and heat transfer was performed for four cases. (1) A rotating/non-rotating smooth two-pass rectangular channel (AR = 2) with a 180° turn in which the rotation number was varied from 0 to 0.22, inlet coolant-to-wall density ratio wa…
Transient gas-solid reactions taking place in a fixed bed reactor have been modeled. Three levels of process space are used: the bed, pellets and grains in meter, millimeter and micron sizes respectively. The multi-component mixture traveling down the reactor through the void sp…
A pressure-based control-volume finite-element method is developed for the solution of heat transfer problems, and laminar flow at all speeds. The method is fully implicit and both transient and steady state flows can be solved without any time step limit due to compressibility …
This study is concerned with the numerical analysis, formulation, programming and computation of solution of steady, 3D conservation equations of reacting laminar duct flow heat and mass transfer in ducts of arbitrary cross-sections. The non-orthogonal boundary-fitted coordinate…
This research is concerned with the development of a mathematical approach for energy and mass transport in solidification modelling involving a control volume (CV) technique and finite element method (FEM) and incorporating non-physical variables in its solution. The former tec…
Microencapsulated phase change material (mPCM) slurries have been used as the working fluids for enhancement of convective heat transfer, thermal energy storage and thermal energy transport due to their high latent heat and almost constant temperature during the change of phase …
Condensation on banks of tubes is of considerable interest in the power, refrigeration and process industries, where large scale condensers form a significant proportion of plant capital costs. Since the pioneering paper by Nusselt in 1916, numerous investigations, both experime…
In a world that is constantly in need of a continuous, reliable and sustainable energy supply, concentrating photovoltaic technologies have the potential to become a cost effective solution for large scale power generation. In this light, important progresses have been made in t…
Vortex shedding is an important mechanism, by which the flow around bluff bodies create forces that excite vibratory motion. Vortex-induced vibration (VIV) is studied for a single circular cylinder by means of Computational Fluid Dynamics (CFD) simulations. An arbitrary Lagrangi…
In this thesis a numerical study has been undertaken to investigate turbulent flow and heat transfer in a number of flow problems, representing the gas-cooled reactor core flows. The first part of the research consisted of a meticulous assessment of various advanced RANS models …