The effect of varying flow rate-counter flow double pipe heat exchanger

$Investigation of fracture behavior and mechanical properties of epoxy composi...$ $Investigation of fracture behavior and mechanical properties of epoxy composi...$

Investigation of fracture behavior and mechanical properties of epoxy composi...

Barhm Mohamad

Flat-plate solar collectors (FPSCs) are the most effective and environmentally friendly heating systems available. They are frequently used to convert solar radiation into usable heat for a variety of thermal applications. Because of their superior thermo-physical features, the use of Nano-fluids in FPSCs is a useful technique to improve FPSC performance. Nano-fluids are advanced colloidal suspensions containing Nano-sized particles that have been researched over the last two decades and identified a fluid composed of strong nanoparticles with a diameter of smaller than (100 nm). These micro-particles aid in improving the thermal conductivity and convective heat transfer of liquids when mixed with the base fluid. The current study provides an in-depth review of the scientific advances in the field of Nano-fluids on flat-plate solar collectors. Previous research on the usage of Nano-fluids in FPSCs shows that Nano-fluids can be used successfully to improve the efficiency of flat-plate collectors. Though several Nano-fluids have been reviewed as solar collector operatin fluids. Nano-fluids have greater pressure drops than liquids, and their pressure drops andhence pumping power rise as the volume flow rate increases. Additionally, the article discusses the concept of Nano-fluids, the different forms of nanoparticles, the methods for preparing Nano-fluids, and their thermos-physical properties. The article concludes with a few observations and suggestions on the usage of Nano-fluids in flat-plate solar collectors. This article summarizes the numerous research studies conducted in this region, which may prove useful for future experimental studies.

Characterization of a flat plate solar water heating system using different n...

Barhm Mohamad

This paper explores the role of the computational fluid dynamics (CFD) modeling technique in the aerodynamic design and propulsion system of the formula 1 car. It provides a study of Reynolds number influences on the state of the boundary layer, unstable and steady flow, time-dependent wake structure, interacting shear layer and separate flows through literature review. As pointed out in is paper, the aerodynamics analysis is conducted to decrease the drag force. Using the computational fluid dynamics (CFD) tools, the analysis was carried out. The major objective of this review article will be to increase the car stability and reduce drag. The efficiency of the track would also increase the air resistance of the vehicle. The ideas of dimensional analysis and uniformity of flows are used to demonstrate that commercial ground cars' aerodynamics are only dependent on the transitional and trans-critical flow regimes.

A review of aerodynamic analysis of commercial automotive-materials and methods

Barhm Mohamad

The 9th International Scientific Conference on Advances in Mechanical Engineering (ISCAME, November 9-10, 2023, Debrecen, Hungary) was organized by the Department of Mechanical Engineering (Faculty of Engineering, University of Debrecen) and the Working Commission of Mechanical Engineering (Specialized Committee in Engineering, Regional Committee in Debrecen, Hungarian Academy of Sciences). The main goal of ISCAME is to yearly bring together engineers, scientists, researchers, practitioners from academia and industry to present their original works and share experiences regarding all aspects of mechanical engineering sciences.

Book of Abstracts from 9th International Scientific Conference on Advances in...

Barhm Mohamad

A REVIEW OF AERODYNAMIC ANALYSIS OF COMMERCIAL AUTOMOTIVE-MATERIALS AND METHODS

Barhm Mohamad

The present study establishes a new estimation model using an artificial neural network (ANN) to predict the mechanical properties of the AISI 1035 alloy. The experiments were designed based on the L16 orthogonal array of the Taguchi method. A proposed numerical model for predicting the correlation of mechanical properties was supplemented with experimental data. The quenching process was conducted using a cooling medium called “nanofluids”. Nanoparticles were dissolved in a liquid phase at various concentrations (0.5, 1, 2.5, and 5 % vf) to prepare the nanofluids. Experimental investigations were done to assess the impact of temperature, base fluid, volume fraction, and soaking time on the mechanical properties. The outcomes showed that all conditions led to a noticeable improvement in the alloy's hardness which reached 100%, the grain size was refined about 80%, and unwanted residual stresses were removed from 50 to 150 MPa. Adding 5% of CuO nanoparticles to oil led to the best grain size refinement, while adding 2.5% of Al2O3 nanoparticles to engine oil resulted in the greatest compressive residual stress. The experimental variables were used as the input data for the established numerical ANN model, and the mechanical properties were the output. Upwards of 99% of the training network's correlations seemed to be positive. The estimated result, nevertheless, matched the experimental dataset exactly. Thus, the ANN model is an effective tool for reflecting the effects of quenching conditions on the mechanical properties of AISI 1035.

An Experimental Artificial Neural Network Model: Investigating and Predicting...

Barhm Mohamad

This paper present of experimental and numerical study of nano Al2O3 cantilever beam for forced vibration, addressing an unexplored area in the existing literature. The proposed nano composite cantilever beam is modeled with hole and crack. The study is based on history loading calculation and composite morphology a global parameter, the transverse crack in nano composite cantilever beam was studied and analyzed experimentally using a four-channel dynamic signal acquisition (NI 9234) module for making high-accuracy measurements and its ideal for vibration applications. The relationship between the dispersion and interaction of the alumina nanoparticles within the cantilever beam and morphology of the solid, hole and crack composite has been identified. Furthermore, the influence of particles Al2O3 at different concentrations (0%, 1%, 3% and 4%) have been studied respectively. Supporting results proved that the crack and hole depth increases with increases of history loading. Nanoparticles dispersed within the specimen can increase energy dissipation during vibration, leading to improved damping characteristics. For future work, it is recommended to utilize statistical frequency domain input, such as Power Spectral Density (PSD), for assessing the structural response instead of employing time history loading.

Experimental study of nano-composite materials on vibration responses

Barhm Mohamad

In this paper, magnetohydrodynamic laminar forced convection of nanoliquid in a rectangular channel with an extended surface, top moving wall and three cylindrical blocks is numerically studied. The Lattice Boltzmann method is used for the resolution of the governing equations. Validity of the numerical home elaborated FORTRAN code was made and good agreement was found with published results. It is interspersed in this work by the effects of the following parameters: Reynolds number (50≤Re≤200), Hartmann number (0≤Ha≤50), nanoparticles volume fraction (0≤φ≤4%) and Eckert number (0.25≤Ec≤1). The numerical solution shows that the local and average Nusselt numbers ameliorate when the value of Reynolds number, Eckert number, and the nanoparticles volume fraction are enhanced. But decreases when the Hartmann number is increased. The impacts of viscous dissipation on heat transfer rate and entropy generation are more noticeable in the presence of a magnetic field. The addition of 4% of nanoparticles enhances the local Nusselt number by about 7%.

Entropy generation and heat transfer rate for MHD forced convection of nanoli...

Barhm Mohamad

Composites with fiber reinforcement are often a popular lightweight option. Due to their unique qualities, fiber-reinforced composites are the best alternative to traditional materials. Mechanical parameters of a carbon fiber-reinforced epoxy resin (CFRE) composite reinforced with date seed granulated powder (DSGP) were examined at the room temperature. The mechanical qualities included tensile, flexural, and impact strength. Enhanced mechanical properties were noticed compared to carbon fiber reinforced epoxy composite produced using the hand lay-up method and vacuum bag. The DSGP-reinforced CFRE with weight ratios of 0%, 15%, 25%, and 35% were considered. The test results revealed the maximum values of breaking force, maximum bending force, energy absorption capacity, and hardness number for 15%, 35%, 25%, 25% Wt DSGP samples. The results show that the optimal composition for carbon fiber reinforced epoxy with date seed granules is in the range from 15% to 25% wt. GDS. This study reveals that carbon fiber-date seed-reinforced composites are excellent substitutes for carbon fiber composites since they offer better mechanical properties at a lower cost.

ANALYSIS OF THE MECHANICAL CHARACTERISTICS OF DATE SEED POWDER-BASED COMPOSIT...

Barhm Mohamad

Solar energy's efficiency and environmental benefits attract academics. In Kirkuk, Iraq, the thermal efficiency, exergy, and entropy of solar collectors were calculated. The experiment involved two glass-topped collectors, fluid transfer tubes, and aluminum heat-absorbing plates. Glass wool insulation minimized heat loss. A 0.5% TiO2/Water nanofluid was created using a mechanical and ultrasonic stirrer. Results showed that solar radiation increased thermal efficiency until midday, reaching 48.48% for water and 51.23% for the nanofluid. With increasing mass flow rates from 0.0045 kg/s to 0.02 kg/s, thermal efficiency improved from 16.26% to 47.37% for water and from 20.65% to 48.76% for the nanofluid. Filtered water provided 380W and 395W of energy in March and April, while the nanofluid increased it to 395W and 415W during these months. Mass flow generated energy, and the Reynolds number raised entropy. The noon exergy efficiency for nanofluids was 50-55%, compared to 30% for water. At noon, the broken exergy measured 877.53 Watts for the nanofluid and 880.12 Watts for water. In Kirkuk, Iraq, the 0.5% TiO2/Water nanofluid outperformed water in solar collectors.

Thermodynamic analysis and optimization of flat plate solar collector using T...

Barhm Mohamad

In this research, it hasibeen shownithat the gas flow iniintake system effects on the FS engineiperformance and acousticibehaviour. The proposedicalculationimethodsiare tested numericallyiand byimeasurements. The team fromiUniversity of Miskolc improvedithe car’s air intakeisystem usingi1D-AVL Boostiwithinithe parametric Fireisoftware Workbenchienvironment. FS regulationsilimit the minimumidiameter of the restrictor to 20 mm, whichiregulatesithe maximumiintake mass flowirate. The plenum, downstreamiof theirestrictor, directly influencesithe amount of freshiair reaching theicylinders. A plenum that isitooilargeicausesithe motorito reactitoo slowlyito the acceleratoriand, in combination withishortisuctionipipes, triggersithe engine to developisufficientitorqueionly atihigh rotationispeeds. A too small plenumibehaves oppositely. Usingithe equationifor the intake runnerilength, the lengthiof the idealirunner was determinedito be approximatelyi 250 mm andiwith aidiameteriof 32 mm. Hence,idesign II of FormulaiStudent Racingi is aibetteri choice. Several calculation techniques were done to calculate transmission loss in different cases for the muffler, white planewaveipropagationiwas applied from generator using two-load method for transmission loss result validation of muffler. Theseican beiconsideredias an accurateicheckiof theianalysisicarried out in thisiwork. It is worthipointingioutithatithis workimayialso serve as aibenchmarkisolutioniforiapproximateiand numericalitechniques used foridealing withihybrid muffleriproblems.

MODELLING AND TESTING OF ADVANCED INTAKE AND EXHAUST SYSTEM COMPONENTS FOR RA...

Barhm Mohamad

Electronic fuel injection (EFI) is a complex system comprising many parts, both mechanical and electronic, controlling an internal combustion engine. It carries out many different tasks. In motorsport, the most important thing to achieve is power optimisation. High power and engine responsiveness are often desired to gain a competitive edge. Usually, motorsport enthusiast will upgrade their stock vehicle with aftermarket components, such as higher rating turbo, longer duration camshafts, and exhaust system. These are difficult to carry out, time-consuming, and expensive tasks compared to the ECU calibration method. In Vietnam, most customers who want to change their vehicle's performance choose the Remap method on Factory ECU. By using the vehicle performance regulation method with a piggyback ECU, it is easier for the user to adjust the power than by the popular Remap method, the advantages being, for example, low cost and easy installation. Currently, there are very few documents describing and evaluating the effectiveness of a piggyback ECU installed in a vehicle. So, in this paper, an experimental reconstruction of an electronic fuel injection system with a piggyback ECU was performed, then the control algorithms of the electronic fuel injection system were simulated in LabVIEW, and the results were compared with the experiment, based on the simulation model of the control algorithm of the EFI system with many modes with different engine loads and speeds. The simulation results are used to evaluate the algorithm for the piggyback ECU.

REMAPPING AND SIMULATION OF EFI SYSTEM FOR SI ENGINE USING PIGGYBACK ECU

Barhm Mohamad

To examine and investigate the impact of nanofluid on heat exchanger performance, including the total heat transfer, the effect of friction factor, the average Nusselt number, and the thermal efficiency, the output heat transfers of a shell and tube heat exchanger using ZnO nanoparticles suspended in water has been conducted numerically. The governing equations were solved using finite volume techniques and CFD simulations with ANSYS/FLUENT Solver 2021. The nanoparticles volume fractions adopted are 0.2% and 0.35% that used in numerical computations under 200 to 1400 Reynolds numbers range. The increasing of temperature is approximately 13% from the bottom to the top of heat exchanger, while the maximum enhancement of Nusselt number is about 10%, 19% for volume fractions 0.2% and 0.35% respectively. The elevated values of the friction factor at the volumetric ratios of 0.2% and 0.35% are 0.25% and 0.47% respectively. The findings demonstrate that the performance efficiency of shell and tube heat exchanger is enhanced due to the increase in Nusselt number.

Evaluation of Shell and Tube Heat Exchanger Performance by Using ZnO/Water Na...

Barhm Mohamad

In this paper, the rate of heat transfer by forced convection in a counterflow heat exchanger, at turbulent flow conditions were investigated experimentally, using porous media and TiO2 Nanofluid to observe the behaviour of heat transfer with flow rate and volume concentration of nanoparticles t enhance heat transfer through it. 3 mm Steel balls (ε=39.12%) as a porous media completely filled to the inner pipe (core pipe). The cold and hot water are used as working fluids through the inner and outer pipes. Then using, the TiO2 nanofluid instead of cold water flowing through the porous pipe to enhance heat characteristics. The effects of operating parameters include flow rate (4 LPM, 6 LPM, and 8 LPM), Reynolds number between (3000 – 7000), and nanoparticle volume fraction (0.001, 0.002 and 0.003) on Convective heat transfer coefficient and Nusselt number. Effective thermal conductivity is increased when the nanoparticle volume fraction is increased. The heat transfer coefficient increases with decreasing nanofluid temperature, but the heating fluid's temperature has no significant effect on the nanofluid's heat transfer coefficient. The results show that porous media and TiO2-based nanofluid's improve heat transfer at flow rate of 4 LPM by 35.4% and improve NTU and effectiveness at flow rate of 4LPM by 12.4%, and 24%, respectively, when compared to pure water without porous media. This improvement in thermophysical properties yielded high heat transfer of heat exchangers used in process industries.

Enhancement of Double-Pipe Heat Exchanger Effectiveness by Using Porous Media...

Barhm Mohamad

Rotary dryer

Barhm Mohamad

Gas absorption is mass transfer operation where one or more species is removed from a gaseous stream by dissoluti on in a l iquid. Packed tower with Raschig Rings packings is used in the experiment The component that is extracted from the gaseous stream is known as solute and the component that extracting the solute is known as solvent. Packed column is one of the com m only use d gas absorption equipment. Packed column can be operated in co current as well as counter currently. Counter current flow is preferable since the contact time between the liquid and gas is greater. This equipment usually consists of a cylindrical column c ontaining a gas inlet and distributing space at the bottom, a liquid inlet and a packing or filing in the tower.

Gas absorption in packed tower with Raschig rings packings

Barhm Mohamad

The effect of varying water flow rate on the performance of mechanical draugh...

Barhm Mohamad

The effect of varying water flow rate on the performance of mechanical draugh...

Barhm Mohamad

There are three modes for heat transfer: convection, conduction, and radiation. The convection heat transfer plays an important role in many industrial applications. The convection heat transfer is usually subdivided into free and forced convection. In the forced convection, the fluid is blown or pumped past the heated surface using a pump or a fan, while in the natural (or free) convection, fluid flow is naturally achieved by buoyancy effects, i.e., density variation in the fluid.

Free and Forced Convection

Barhm Mohamad

Fluid Mechanic Lectures

Barhm Mohamad

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