Esam Jassim

Prince Mohammad University · COE Department

The purpose of this research is to experimentally evaluate the degree of enhancement in the heat transfer and entropy generation when nanoparticles mix with ordinary water. Several concentrations of Al2O3 nanoparticles at various flowrates are investigated to assess the enhancement in the exchanger's (NTU) and efficiency. Results illustrate that th...

The purpose of this research is to experimentally evaluate the degree of enhancement in the heat transfer and entropy generation when nanoparticles mix with ordinary water. Several concentrations of Al2O3 nanoparticles at various flowrates are investigated to assess the enhancement in the exchanger’s (NTU) and efficiency. Results illustrate that th...

The present research aims to experimentally investigate the influence of mixing Titanium Oxide nanoparticle with distilled water on the performance and energy-environment interrelation of a concentric heat exchanger at variable cold/hot flowrate ratio and mixing percentage. The target parameters of interest include the heat capacity ratio (the flow...

Nowadays, nanofluids are plays a prominent role in enhancing the mechanism of the heat transfer. However, some nanofluids could have adverse impact on environment. The main objective of this work is to experimentally investigate the improvement of mixing nanoparticle (Titanium Oxide in this case) with the conventional fluid (water) on the heat exch...

Upgrading the performance on the heat exchanger by ameliorating the thermal properties of the working fluid can be achieved by mixing nano-sized solid particles with the base fluid. The present study reports the impact of mixing metallic oxide nanoparticles with distilled water on the heat transfer, heat loss, and effectiveness of Plate-type Heat E...

The utilization of nanofluid in heat exchanger is of immense interest in the petrochemical and power plant industries due to the durability provided to the exchanger long-life operation. In the present research, an experimental investigation is carried out to study the existence of copper and aluminum oxide nanoparticles in the base fluid and their...

The aim of the study is to experimentally investigate and compare the influence of two different nanofluids (Cu/water and Al2O3/water) on the performance of a double pipe heat exchanger at different volume concentrations and flow rates. Effect of varying hot-side inlet temperature is also tested for the selected concentrations. The nanofluid, pumpe...

The article Experimental assessment of Al2O3 and Cu nanofluids on the performance and heat leak of double pipe heat exchanger, written by Esam I. Jassim & Faizan Ahmed, was originally published electronically on the publisher’s internet portal (currently SpringerLink) on 16 January 2020 with open access.

The study presents the particle deposition and aggregation phenomena by introducing new parameter called Particle Deposition Number PDN, defined as the ratio of the particle instantaneous velocity to its capturing value. The particle capture or rebound fate will decide from knowing such number. The study employed new scheme of particle deposition i...

Biomass materials—such as crop and forest residues, dedicated energy crops, and plant oils— are recently receiving much attention due to their carbon-neutral emission. The process of transesterification is used for the conversion of triglycerides (the main component of vegetable oils and animal fats) to engines fuel. Computational fluid dynamics (C...

The ignition timing in a Spark Ignition Engine plays a prominent role in achieving high efficiency. However, ignition occurrence varies with the type of the engine and the type of the fuel in use. Ignition timing is different between engines, not only because of the thermal behavior of the combustion process, but also due to the morphology of the f...

The removal process of undesirable non-gaseous particles from ore natural gas is still a challenge due to the absence of reliable equipment that achieve high filtration performance. Supersonic nozzle has recently been introduced as a robust means to meet such demands. However, it continues to be a great need to identify the optimal shape of the sup...

A pilot-scale HVAC system is constructed to study the performance of air quality inside the comfort-zone when small fans are utilized to perform the air circulation. The research investigates the impact on energy consumption when the fan of the coil is eliminated from the fan coil unit (FCU). This would improve access to separate comfort zone contr...

In the present study, a numerical simulation is conducted to predict the influence of convergent-divergent nozzle geometry and NPR on the skin friction and shockwave location. Various shapes of nozzles are numerically simulated using the Computational Fluid Dynamics code. The shock position is examined to demonstrate the impact of nozzle shape on i...

Supersonic nozzles with low intensity shock have been reported by oil and gas sectors ideal equipment for eliminating undesired second phases from natural gas during purification process. In this paper, analytical and numerical methods are developed to predict the location of shock for an axisymmetric convergent-divergent nozzle. Six different shap...

Spiral coil offers a substantial amount of heat transfer area at a considerably low cost as it does not only have a lower wall resistance but it also achieves a better heat transfer rate in comparison to conventional U-tube arrangement. The general aim of the study is to assess different configurations of spiral coil heat exchangers that can eventu...

The combustion of coal is a complex series of reactions, dominated by the transport mechanism. An aspect that is poorly understood is the influence that the evolution of trace elements has on the environment and the pollution level. To explore this impact, a mathematical model of arsenic was incorporated into a computational fluid dynamics code to...

Coal combustion is a complex series of reactions, dominated by transport mechanisms. A poorly understood aspect is the influence that fragmentation of excluded pyrite minerals has on the combustion thermal history and sulfur release. To explore this effect, fragmentation was incorporated into a mathematical model consisting of several stages, namel...

A computational fluid dynamics code for calculating three dimensional reacting flows is used to predict the combustion behaviour of pulverized coal inside a Drop Tube Furnace (DTF). The CFD model has linked the eddy dissipation concept with the finite rate chemistry model in calculating the near flame zone field and the far field regions of the fla...

A new model describing the mechanism of the hydrate deposition based on the most recent particle dynamics theories is developed. The model splits the motion of the particle into two main regions: the turbulent and the sublayer regions.A novel approach is used to define the particle migration and attachment in the sublayer region. Depending on the r...

Main conclusions can be summarized as follows: · Shockwave has been studied using the CFD approach. The effects of real gas properties on the flow behavior were also addressed. It is crucial to beware of the real gas fluid behavior when analyzing high pressure natural gas flow systems. The assumption of a perfect gas may give rise to significant er...

A mathematical model was developed to study the vaporization of trace elements during the combustion of individual coal and pyrite particle. The initial modeling has focused on the release of As, Se and Sb associated with pyrite since it is the host site for these elements. The model considers the release of the trace elements from pyrite included...

Abstract The behavior of pyrite and other sulfide minerals in gasification processes are of fundamental importance to coal utilization technologies. Previous work has established that the physical and chemical transformations of impurities depend on mineralogy, the mineral distribution in the coal particles, and the presence of organically associ...

The computational fluid dynamics technique is used to study the behavior of high-pressure natural gas when it flows through nozzles with supersonic velocities. Effect of nozzle geometry is discussed by inserting a constant area channel between the convergent and divergent parts of the system. Various conduit lengths are analyzed to show how the min...

The computational fluid dynamics technique was used to study the behavior of high-pressure natural gas in supersonic nozzles. Although many applications of gas flow produce insignificant errors when the gas is assumed ideal, our results indicate significant variation of gas properties. This article illustrates natural gas behavior when it is consid...

Hydrate is a major risk in all high pressure natural gas transport lines including the connecting lines and manifold systems in all offshore production facilities. Marine transportation of compressed natural gas is one example where prediction of hydrate formation in loading and unloading lines and manifold systems is a requirement for the safe tra...