Akram H. AbedUniversity of Technology- Iraq
Akram H. Abed
Doctor of Engineering
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34
Publications
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Introduction
Akram H. Abed works at the Department of Electro-Mechanical Engineering, University of Technology, Iraq.
Skills and Expertise
Publications
Publications (34)
The characteristics of heat transmission in a cylindrical tube equipped with novel
geometric turbulators inserts were investigated experimentally. The effects of two
geometric parameters (ratio of pitch P=L/D and interior angle) on fiction factor, Nusselt
number, the thermal executions were tested and compared with a smooth tube for the
same co...
The article notes the disadvantages of application of dry cooling towers and air-cooled condensers for heat elimination. The cooling air humidifying is considered as a prevalent method of these heat removers efficiency increasing. The way of heat-transfer coefficient rise is proposed using the water mist which enables the latent heat of water evapo...
The investigation of the performance traits of two types of thermal receivers used in parabolic sunray air heaters is the primary goal of this work. At the focal length of a parabolic trough, one evacuated tube receiver, with a copper heat tube placed in it (case 1), and one with a pyramidal square receiver and fins (case 2), was used to compare th...
This work aimed to investigate the effect of ultrasonic waves on heat transfer enhancement under a subcooled pool condition. For this purpose, a cylindrical rod is submerged in distilled water and a 1.7 MHz ultrasonic transducer was utilized to generate ultrasonic waves. Three main parameters were examined including loaded heat flux, water temperat...
The steady, internal, and ultrasonic-generated water mist cooling in a uniformly heated vertical cylinder with evaporating subcooled water film has been investigated experimentally. The goal is to elucidate the effects of different operating parameters, viz. water mist concentration, carrier gas velocity, loaded heat flux, and flow orientation on t...
In present study, the effect of combining single-slope solar still unit with high-frequency ultrasonic vaporizer, PCM capsules, and external solar water heater on improving its performance was experimentally investigated. A single-slop solar still was developed and examined under the harsh climate of Baghdad city in middle Iraq territory. Compared...
In this paper, natural convection heat transfer of parallel-plate rectangular fins heat sink positioned at a certain angle on the vertical substrate was experimentally investigated. Experiments were done with an aim to examine and evaluate the enhancement of heat transfer by deploying fine water mist into ambient air under a range of input power. T...
The paper is dedicated to the new cooling scheme examination where aerosol is injected directly into the air-cooling system and then the evaporated aerosol is collected and redirected back to the inlet ports. It has examined the air-and-water aerosol influence on the heat extractor characteristics and area of the cooling surface of radiator with pa...
Unsteady forced convection heat transfer of a stationary and rotating sphere in an open-loop air system was experimentally investigated with an aim to evaluate the influence of sphere rotation rate on the heat transfer enhancement. A special-purpose conical diffuser having a circular cross-section with constant divergence angle has been carefully d...
Цель этой работы заключается в оценке влияния вихреобразования на эффективность теплоотдачи и структуру потока при обтекании сферы с внутренними источниками тепла. Численное моделирование и экспериментальная проверка выполнена с использованием при стационарном обтекании медной сферы, расположенной внутри цилиндрического канала. Численное моделирова...
The present study focused on evaluating the heat transfer behavior and predicting the surface resulting status during air/water droplets two-phase flow. Transient heat transfer based on the lumped capacitance model (LCM) was investigated experimentally under a range of water droplets concentration, surface temperature, and varying Re number. Compar...
The objective of this work is to evaluate the convective heat transfer and flow characteristics around three heated spheres in a tandem arrangement. Numerical simulation and Experimental verification were performed using stationary copper spheres located inside a cylindrical channel with constant channel-to-sphere diameter ratio. Numerical simulati...
In this study, two approaches to investigating the process cooling of a heated sphere were performed using air as well as air/water mist two-phase flow. Steady-state and unsteady heat transfer analysis were compared in the terms of the aver-age surface temperature and heat transfer rate between the sphere surfaces and the cooling fluid. When the Bi...
The heat transfer from a single sphere suspended in a cylindrical channel with finely dispersed air-water (aerosol) flow is experimentally studied. Under stationary heating conditions, the values of the heat-transfer coefficients are obtained as dependent on the Reynolds number and the water mist rate. A physical model of heat transfer from the sph...
The solar air heater is a widely used thermal application of renewable energy. Various thermal storage materials, either sensible or latent, could be adopted for solar air heater, so that the thermal energy can be saved at sunny hours for use after the sunset. Considering its latent heat of fusion, paraffin wax, a phase change materials (PCM) was s...
Advanced nuclear power plants are equipped with passive emergency heat removal systems (PEHRS) for removing the decay heat from reactor equipment in accidents accompanied by primary circuit leakage to the final heat absorber (ambient air). Herein, the intensity of heat dissipation to air from the outer surface of the heat exchanger achieved by buoy...
The objective of this work is to evaluate the influence of vortices on heat transfer behaviour and a flow structure around a heated sphere. Numerical simulation and experimental verification are performed using a stationary copper sphere located inside a cylindrical channel with a constant channel-to-sphere diameter ratio. Numerical simulation is d...
This paper aims to evaluate the effects of water mist on steady natural convection heat transfer from a sphere. Experimental investigations were performed for the Nusselt number (Nu) under a range of water mist concentration in both cases, sphere located in an open volume space with constant surrounding temperature and inside a cylindrical channel...
An experimental investigation was performed to evaluate the hydrodynamics and heat transfer characteristics in a tandem arrangement of heated rows packed inside cylindrical channel using air as well as air/water mist flows as working medium. The average surface temperature has been recorded under various air main flow, water mist rate, surface heat...
To improve the cooling performance for the future generation of gas-cooled equipment, experimental studies on air/water mist heat transfer of single sphere inside a cylindrical channel have been carried out with an aim to investigate the heat transfer enhancement by suspending tiny water mist into air flow. The effect of the different key factors s...
The changes that do occur in the air ambient properties with increasing concentration of water mist (fog) have a significant influence on heat exchange process between the building and the surrounding medium. In the present paper, the average and local heat transfer coefficient was estimated from surface temperature data obtained using infrared (IR...
The changes that do occur in the air ambient properties with increasing concentration of water mist (fog) have a significant influence on heat exchange process between the building and the surrounding medium. In the present paper, the average and local heat transfer coefficient was estimated from surface temperature data obtained using infrared (IR...
The main purpose of the present investigation is enhancing heat transfer rate in a tube heat exchanger by using V-shape twisted Jaws. The air is used as a working fluid and pumped through the test section with different values of Reynolds number (6000-19500), while the heat flux has been selected as a constant boundary condition around the tube sec...
This paper aims to determine the hydrodynamic characteristics of flow around the sphere in unsteady state condition. An experimental test-rig was designed and constructed for this purpose with the application of an adjusted laser optics system. It is based on the technology of pulsed particle visualization of micro tracers in the cross section per...
In this work, a combination between latent heat storage materials (LHSm) and sensibleheat storage materials (SHSm) as new storage heat material in flat plate solar air heater wastested experimentally. PCM (paraffin wax) at a certain ratios (10%) and (20%) were used asLHSm with a pure cement (base material) as SHSm. The experimental tests was donein...
Solar air heater (SAH) is extensively used in residential, industrial and agricultural fields. This work aims to investigate of using aluminum foam matrix integrated with PCM (paraffin wax) as thermal storage material in solar air heater. An experimental system of solar air heater is designed and constructed. The experimental results indicated that...
In this work, the effect of using inner longitudinal fins in a rectangular encapsulation on the PCM (paraffin wax) melting process was studied numerically and experimentally. An enthalpy transformation method was used in the numerical solution to transfer the equation of energy into a nonlinear equation with a single dependent variable H (enthalpy)...
The present work aims to enhance the thermal storage efficiency and thermal behavior for solar air heater integrated with cylindrical capsules system. The cylindrical capsule has diameter 50 mm and length 600 mm, placed in the cross flow of airstream. In this experimental study, a high specific heat of latent heat storage materials (PCM-paraffin wa...