Mohammad Mohsen Peiravi

Bio: Mohammad Mohsen Peiravi is an academic researcher from Islamic Azad University. The author has contributed to research in topics: Heat transfer & Nusselt number. The author has an hindex of 5, co-authored 6 publications receiving 112 citations.

3D optimization of baffle arrangement in a multi-phase nanofluid natural convection based on numerical simulation

Abstract: The purpose of this study is investigating the effect of using multi-phase nanofluids, Rayleigh number and baffle arrangement simultaneously on the heat transfer rate and Predict the optimal arrangement type of baffles in the differentiation of Rayleigh number in a 3D enclosure.,Simulations were performed on the base of the L25 Taguchi orthogonal array, and each test was conducted under different height and baffle arrangement. The multi-phase thermal lattice Boltzmann based on the D3Q19 method was used for modeling fluid flow and temperature fields.,Streamlines, isotherms, nanofluid volume fraction distribution and Nusselt number along the wall surface for 104 < Ra < 108 have been demonstrated. Signal-to-noise ratios have been analyzed to predict optimal conditions of maximize and minimize the heat transfer rate. The results show that by choosing the appropriate height and arrangement of the baffles, the average Nusselt number can be changed by more than 57 per cent.,The value of this paper is surveying three-dimensional and two-phase simulation for nanofluid. Also using the Taguchi method for Predicting the optimal arrangement type of baffles in a multi-part enclosure. Finally statistical analysis of the results by using of two maximum and minimum target Function heat transfer rates.

Hybrid conduction, convection and radiation heat transfer simulation in a channel with rectangular cylinder

Abstract: The innovation of this study is to investigate the combination effect of thermal radiation and convection in the hybrid heat transfer between solid and fluid in a channel. The lattice Boltzmann method based on the D2Q9 scheme has been utilized for modeling fluid and temperature fields. Streamlines, isotherms, vortices and Nusselt numbers along the wall surfaces have been investigated for different Reynolds numbers (Re = 10, Re = 60, Re = 133.3), Peclet numbers (Pe = 7.1, Pe = 42.6, Pe = 94.7), the emission coefficients (e = 0.3, e = 0.7, e = 1), radiation coefficients (RP = 0.010, RP = 0.015, RP = 0.020) and diffusion coefficients (αs = αf, αs = αf/2, αs = 2αf). The mean Nusselt number (Num) fluctuations have been analyzed for different cases to predict optimal levels of effective factors of this simulation in order to maximize and minimize the heat transfer rate. The results show that by increasing the Reynolds number to Re = 133.3, the maximum average Nusselt number can be changed by more than 9.249 time. Also by increasing the thermal diffusion coefficient to αs = 2αf, the minimum average Nusselt number can be changed by less than − 0.687 time.

Numerical analysis of secondary droplets characteristics due to drop impacting on 3D cylinders considering dynamic contact angle

Abstract: This study is investigating three-dimensional numerical simulation of a Newtonian droplet impact and break on two square cylinders based on dynamic contact angle of droplet at the spatial interface between two solid–fluid phases. The droplet impact details and morphology studied in the present work could provide ideas for the spray wall impingement modeling in the simulation of many industrial applications, such as spray painting and liquid cooling of surfaces. The droplet impact is investigated on two square cylinders in 9 different modes with different droplet diameters and physical conditions such as different positions of droplet. The volume of fluid (VOF) method was used with open-source software. The results have been compared and validated quantitatively and qualitatively with the experimental results. Results represent droplet diameter into cylinder dimension and velocity profiles are affected on number of broken droplets, break times and droplet deformation. Also, mean velocities of droplet after impact on two square cylinders at first break time were 0, 0.025, 0.12, 0.47, 0.11, 0.08, 0.2, 0.012, 0.19 m/s for cases 1–9, respectively. Moreover, in case 7 that droplet diameter into cylinder dimension was 2, the maximum number of break-up into secondary droplets was 10 drops that occurred for 4 times.

Numerical study of fins arrangement and nanofluids effects on three-dimensional natural convection in the cubical enclosure

Abstract: This investigation is a three dimensional comprehensive heat transfer analysis for partially differentially heated enclosure with the vertical fin mounted on the hot wall. The thermal lattice Boltzmann based on D3Q19 method is utilized to illustrate the effects of vertical fins and nanoparticles on the flow and thermal fields. The effects of Rayleigh number and different arrangement of fins on the fluid flow and heat transfer have been scrutinized. The streamlines and isotherms and Nusselt number along the hot wall are illustrated for 104

Nano particles distribution characteristics in multi-phase heat transfer between 3D cubical enclosures mounted obstacles

Abstract: The innovation of this paper is hybrid heat transfer simulation of two different multi-phase nanofluid simultaneously between two 3D enclosures under heat flux boundary condition. This present work with arrangement of different shape of mounted obstacles effects has practical applications such as energy storage systems. Velocity and temperature fields of fluid flow are modeled based on the D3Q19, Lattice Boltzmann Method. Nanoparticle volume fraction, temperature fields, mean and local velocity in 24 cases of enclosures with 5, 7 and 9 obstacles in hot zone and 10, 14 and 18 obstacles in hot and cold zones have been investigated for arrangement rectangular, circle, vertical and horizontal ellipse obstacles. rates of mean temperature in each enclosure have been analyzed. The results presented that minimum of fluid velocity in left enclosure was in 0.4 y / L 0.5 , and maximum was in 0.15 y / L 0.25 and 0.7 y / L 0.85 . Also, maximum and minimum of mean temperature in left enclosure on the wall ( y = 0 ) were in enclosures with 9 rectangular obstacles in hot zones that was equal to 48.37 °C (%8.3) and 10 horizontal ellipse obstacles in hot and cold zone that was equal to 45.03 °C (%0.8), respectively.

Thermal-hydraulic performance and design parameters in a curved-corrugated channel with L-shaped baffles and nanofluid

Abstract: High heat generation is seen as a major issue in most mechanical and manufacturing industries, carrying with huge sub-problems. One of the possible cooling techniques is the combination of two or more passive methods, in particular for those parts with complex geometry. In this study, flow structure and heat transfer characteristics of the novel channel namely: curved-corrugated channel are numerically studied with using ZnO-water nanofluid and presence of L-shaped baffles. The influences of corrugations, baffles manner arrangement, and geometric parameters; corner angle (γ= 30°,45°,60°, and 90°) and blockage ratio (BR=0.25,0.3. 0.35, and 0.4), at different Reynolds number (8000–32000) and volume fraction of ZnO particles (0–4%) are evaluated using thermal-hydraulic performance method. The multi-phase mixture and the κ-e model are used to simulate turbulent nanofluid flows inside the curved-corrugated channels at constant temperature condition (T = 355 K). The results reveal that the formation of vortex flow and increased turbulence due to effects of corrugations and baffles can improve the heat transfer enhancement. Inline arrangement of baffle is superior to the staggered arrangement in thermal-hydraulic performance (PEC), and at lowest angle 30° provide the best PEC. Regarding the friction ratio and compared to those of a plain channel, the effect of blockage ratio is considerable as it yields a multiplier impact of the corner angle. Reducing the blockage ratio and the corner angle, i.e. 0.25 and 30°, yields to the best PEC at 1.99. New correlations for Nusselt number and friction factor for baffled curved-corrugated channel with using nanofluid are also reported.

3D optimization of baffle arrangement in a multi-phase nanofluid natural convection based on numerical simulation

Abstract: The purpose of this study is investigating the effect of using multi-phase nanofluids, Rayleigh number and baffle arrangement simultaneously on the heat transfer rate and Predict the optimal arrangement type of baffles in the differentiation of Rayleigh number in a 3D enclosure.,Simulations were performed on the base of the L25 Taguchi orthogonal array, and each test was conducted under different height and baffle arrangement. The multi-phase thermal lattice Boltzmann based on the D3Q19 method was used for modeling fluid flow and temperature fields.,Streamlines, isotherms, nanofluid volume fraction distribution and Nusselt number along the wall surface for 104 < Ra < 108 have been demonstrated. Signal-to-noise ratios have been analyzed to predict optimal conditions of maximize and minimize the heat transfer rate. The results show that by choosing the appropriate height and arrangement of the baffles, the average Nusselt number can be changed by more than 57 per cent.,The value of this paper is surveying three-dimensional and two-phase simulation for nanofluid. Also using the Taguchi method for Predicting the optimal arrangement type of baffles in a multi-part enclosure. Finally statistical analysis of the results by using of two maximum and minimum target Function heat transfer rates.