Ghalib Kahwaji

Ghalib Kahwaji
Rochester Institute of Technology Dubai · Mechanical engineering

About

28
Publications
770
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
57
Citations

Publications

Publications (28)
Article
In a prior study, the novel shroud−chimney configuration (SCC) (semicircular shrouds and expended chimney) has been numerically demonstrated to passively augment natural convection heat transfer from a horizontal cylinder. However, to implement such a configuration for practical utilizations, the heat flow properties must be experimentally observed...
Article
A novel method to passively improve natural convection from a horizontal isothermal cylinder is proposed and numerically analyzed. The improvement is achieved by using a cylinder configured with semicircular shrouds and expended chimney. The numerical simulations indicate that adding the shroud–chimney configuration (SCC) to the cylinder promotes t...
Conference Paper
Natural convection heat transfer around a horizontal cylinder has received considerable attention through decades since it has been used in several viable applications. However, investigations into passively enhancement of the free convective cooling using external walls and chimney effect are lacking. In this work, a numerical simulation to study...
Article
The freezing of water around immersed unfinned and finned horizontal tubes is simulated numerically. The impact of natural convection as well as the water density inversion with temperature is considered. The equations governing both fluid flow and heat transfer around the tubes and through the solid-liquid interface are solved using finite differe...
Conference Paper
The freezing of water around finned and unfinned horizontal tubes inside an insulated tank is analyzed and numerically simulated. The coupled conduction-convection heat transfer with phase change moving interface is solved numerically using finite difference technique. Adaptive grid generation is performed by elliptic partial differential equations...
Article
Full-text available
In the present work, the enhancement natural convection heat transfer utilizing nanofluids from horizontal square cylinder situated in a square enclosure is investigated numerically. The type of the nanofluid is the water-based Cu. The developed model is used to investigate the performance of heat transfer of nanofluids inside an enclosure taking i...
Article
Full-text available
In the present work, the enhancement natural convection heat transfer utilizing nanofluids from horizontal square cylinder situated in a square enclosure is investigated numerically. The type of the nanofluid is the water-based Cu. The developed model is used to investigate the performance of heat transfer of nanofluids inside an enclosure taking i...
Article
Full-text available
In the present work, the enhancement of natural convection heat transfer utilizing nanofluids as working fluid from horizontal circular cylinder situated in a square enclosure is investigated numerically. Different types of nanoparticles were tested. The types of the nanofluids are Cu, Al 2 O 3 and TiO 3 with water as base fluid. A model is develop...
Article
Full-text available
In the present work, the natural convection heat transfer from horizontal cylinder with square cross section situated in a square enclosure, vented symmetrically from the top and the bottom was investigated numerically. The work investigate the effect of the Ra, enclosure width and opening size of the enclosure on the streamlines, isotherms and hea...
Research
Full-text available
The present paper includes analytical investigation of the validity of total resistance heat dissipation model using variable heat transfer coefficient for annular fins constant thickness. The model is given as: 2 am 1 am am 2 2 i 2 o 2 i o th) ri ro (ro) ri ro)(2 am (ka 2) 2 am)(1 am () ri ro () r r (K 4 W KW 2) r / r ln(TR Furthermore, a finite d...
Article
The present paper includes analytical investigation of the validity of total resistance heat dissipation model using variable heat transfer coefficient for annular fins constant thickness. The model is given as:) ri ro (ro) ri ro)(2 am (ka 2) 2 am)(1 am () ri ro () r r (K 4 W KW 2) r / r ln(TR Furthermore, a finite difference method using SOR techn...
Article
The exhaust gases of gas turbines carry a significant amount of thermal energy that is usually expelled to the atmosphere without taking any further part in the power generation process. This low grade thermal energy can however be put into beneficial use as a heat source to a vapor absorption chiller that serves as cooling system to be operated du...
Research
Full-text available
This research aims at investigating the economics of domestic solar hot water systems in order to promote the use of such systems in Iraq in spite of the low prices of the natural energy sources. The integrated collector storage system, suggested by Kahwaji, is adopted in this study due to its simplicity and good thermal performance especially with...
Article
An indirect solar food drier of the cabinet type employing a corrugated plate flat solar collector is designed and tested in the city of Mosul, Iraq. The testing indicated a significant effect of the collector flow rate on the collector efficiency which varied between 49.7% to 62.6% around the year. Summer time efficiency of the drier reached ∼ 35%...
Conference Paper
Solar energy, as a renewable energy resource, is becoming increasingly popular due to its availability and cleanliness. Different types of solar energy system were designed and fabricated to meet different allocation requirements. The integral collector storage (ICS) system is one of promising solar system due to some attractive features such as it...
Article
Convective heat transport coefficients are computed from data obtained from a full-scale test in a closely controlled, passive solar sunspace. The subtractive convective heat transport at the surface is calculated from the conductive and radiative fluxes. Methods for calculating these fluxes from measured data, and estimating best fit coefficients...
Article
Allowing a solar system that is governed by Bang-Bang controllers to cycle is shown to have an effect on the overall energy collection. An analytical method to evaluate the relative increase in collected energy (RICE) is developed and a design procedure for the selection of the set point ..delta..T/sub ON/ of the controller is presented. The perfor...
Article
An experimental investigation of the heat transfer in annular fins of constant thickness was carried out to prove the total resistance model suggested by Kahwaji [4] , given in equation (1) in the introduction . The experiments covered both the natural convection and forced convection heat transfer modes using fins of different materials and dimens...
Article
Typescript (photocopy) Dissertation (Ph.D.)--Colorado State University, 1987. Bibliography: leaves [110]-118.

Network

Cited By

Projects