Pankaj KUMAR Gupta

Guru Ghasidas University · Department of Mechanical Engineering

A detailed computational investigation was conducted to explore the dynamics of high-speed free slurry jets, with a focus on how variations in abrasive size and concentration affect their behavior. The study yielded several significant observations: Firstly, it was observed that slurry jets containing larger particles exhibited notably higher avera...

Efficient transportation of minerals and solid materials through pipelines requires very complex parameters and conditions. This research investigates the correlations between different flow parameters and pipe design elements to predict bend pressure drop—a factor that indicates the possibility of erosion both in the straight pipeline sections and...

Access to safe drinking water remains a global challenge, primarily due to the prevalence of water contamination in various regions. Numerous methods have been explored to address this issue and convert polluted water into potable sources. However, the cost associated with these methods often hinders their widespread adoption. Solar distillation, h...

In most engineering applications where a high-speed water jet is used, its nozzle outlet geometry has a significant role in studying the effect of jet performance and its flow dynamics. In the present work, a free turbulent jet used in various engineering applications like high-speed water jet machining is examined with its nozzle geometry effect o...

The present research work shows the numerical investigation of free turbulent jet behavior as well as thermal characteristics of the jet being issued from the circular nozzle outlet and it is performed by solving the different Reynolds averaged Navier-Stokes (RANS) equation. In this research work, central jet velocity, and turbulent intensity of th...

In order to use solar energy to convert raw ground and surface water into clean potable water, several distillation systems have been investigated so far. However, to be sustainable, the productivity of these systems must be as high as possible. Tubular solar stills (TSS) were investigated as one of the more productive solar distillation systems. T...

Productivity improvement is one of the high-priority areas in the development of solar stills. The present work describes the use of some low-cost energy storage materials such as sand, gravels, and black granite as potential candidates to improve the productivity of the tubular solar still (TSS). The experimental studies have been carried out at N...

Abrasive flow jet machining (ASJM) is modern manufacturing technique which uses comparatively low-pressure abrasive flow jet for machining various machined surfaces like holes, channels and intricate shapes which is not possible from conventional machining processes. The effect of abrasive particle concentration on the impacting slurry velocity on...

Solar energy is being used for the purpose of water distillation since long. The present work demonstrates the comprehensive experimental investigation of various heat transfer enhancement arrangements on tubular solar still for its performance improvement. These arrangements include; case-1: Tubular solar still (TSS) with flat plate basin (TSS-FP)...

Dense particulate slurry flow field through 90O circular pipe bends is numerically investigated in the present work. The dense slurry is modelled using Eulerian-Eulerian approach treating the phases as co-existing continua that exchange mass, momentum and energy with each other. Finite volume technique as implemented in ANSYS-FLUENT has been employ...

The paper presents the development and testing of low cost reflective panel type solar cooker. The construction of the base panel type cooker utilizes low cost materials. Two designs of the panel type cooker are tested vis-à-vis conventional box type cooker. Temperatures are measured in the solar cooker at various points and are compared with the b...

Thispaperreportsthefindingsofnumericalinvestigationofdenseparticulateslurryflowfieldinaslurrypipelinewith an objective of examining erosive wear. Parametric study with velocities 2 m/s, 2.75 m/s and 3.5 m/s, and volumetric concentration of 4% and 26% were carried out on a pipeline of nominal inside diameter 105 mm. The range of volumetric concentra...

Aluminium is broadly utilized in Aerospace and Automobile industry due to its light weight and due to this property; it is an attractive research field. Aluminum alloy is very important engineering material and Aluminium metal matrix composites (AMMCs) are created by two or more materials (where one material is metal) for improving the material pro...

Femoral artery is a one of the prime artery of the body and is susceptible to peripheral arterial disease when it is blocked through atherosclerosis In the present investigation, flow through femoral artery bend has been modeled using Computational Fluid dynamics approach for the purpose of determining the hemodynamics in relation to atherosclerosi...

This chapter deals with introduction of an innovative field Computational Fluid Dynamics and its application for solution of multiphase flow. As an example case of it the solution of the liquid-gas flow through the pipeline has been illustrated. Multitudes of industrial processes involve the multiphase flow conditions, amongst them the oil and gas...

Detailed insight into dense multisize particulate flow field in a straight channel subject to spanwise system rotation is presented for the first time. Mathematical modelling employs Eulerian-Eulerian (continuum-mechanical) approach accounting for the broad particle size distribution that is common place in industrial slurries. Numerical formulatio...

A teaching-learning tool for elementary psychrometric processes on psychrometric chart is developed using MATLAB. First, coding was done in MATLAB to represent the psychrometric chart showing various properties. Secondly, calculations for obtaining various psychrometric parameters of air-water vapor mixture given any two input parameters were coded...

Detailed insight into dense multisize particulate flow field in a straight channel subject to spanwise system rotation is presented for the first time. Mathematical modelling employs Eulerian-Eulerian (continuum-mechanical) approach accounting for the broad particle size distribution that is common place in industrial slurries. Numerical formulatio...

The work reveals an interesting and contra-intuitive observation in numerically simulating the solid-liquid flow field through a straight rotating channel. A previous study (Gupta and Pagalthivarthi, 2007) showed that at moderate rotation rates, increase in rotational speed results in an asymmetric velocity profile, because the Coriolis acceleratio...

The work reveals an interesting and contra-intuitive observation in numerically simulating the solid-liquid flow field through a straight rotating channel. A previous study (Gupta and Pagalthivarthi, 2007) showed that at moderate rotation rates, increase in rotational speed results in an asymmetric velocity profile, because the Coriolis acceleratio...

Low cost solar cookers are developed and tested. The paper discusses the methodology, development and testing of a reflective panel type low cost solar cooker. From the tests, it is found that such low cost solar cookers are dependable and viable alternative to cooking using conventional sources. The cooker is found suitable for cooking once in win...

Flow and temperature field inside a direct type solar dryer is investigated using Computational Fluid Dynamics (CFD). The coupled field analysis is carried out in ANSYS Fluent 12.0. The effect of location of inlet and outlet vents on the predicted velocity and temperature field of the air inside the dryer is analyzed. It is observed that a more uni...

The paper discusses numerical prediction of erosion wear trends in centrifugal pump casing pumping dilute slurries. The casing geometry is considered two-dimensional. Discrete Phase Model (DPM) in FLUENT 6.1® is utilized to obtain dilute slurry flow field through the pump casing employing two-way coupling. Standard k - ε model is used for turbulenc...

Dense slurry flow through centrifugal pump casing has been modeled using the Eulerian-Eulerian approach with Eulerian multiphase model in FLUENT 6.1®. First order upwinding is considered for the discretization of momentum, k and ε terms. SIMPLE algorithm has been applied for dealing with pressure velocity coupling. A mixture property based k-ε turb...

The present work compares the performance of three turbulence modeling approach (based on the two-equation k -ε model) in predicting erosive wear in multi-size dense slurry flow through rotating channel. All three turbulence models include rotation modification to the production term in the turbulent kineticenergy equation. The two-phase flow field...

Erosion wear prediction in fully developed multi-size particulate flow through horizontal pipes is carried out numerically using Galerkin finite element methodology. The predicted multi-size particulate flow field near the pipe wall is correlated with wear rates via empirically determined wear coefficients. The wear models for particle impact and s...

A comparison of three turbulence models in modeling and validating dense multi-size particulate flow through rotating channel is presented. All the three turbulence models incoporate a rotation modification to the production term in the turbulent kinetic energy equation. In the first model, rotation-modified k - ε equations are used to compute the...

The objective of the present work is to predict erosive wear in multi-size dense slurry flow in a rotating channel. The methodology comprises numerical prediction of two-phase flow which is accomplished using the Galerkin finite ele-ment method. The wear models for both sliding wear and impact wear mechanisms account for the particle size dependenc...

The study deals with the numerical simulation of dilute solid-fluid flow in a two-dimensional straight rotating channel using Lagrangian particle tracking method. The developing carrier-phase flow, assumed to be steady in the mean, is computed using Galerkin finite element method. A rotation-modified k-ε model is used to account for the effect of t...

Galerkin finite element methodology (with Q1Q0 elements) is used to quantify the effect of Coriolis force on multi‐size slurry flow through rotating channels. A rotation‐ and concentration‐modified κ ε model is used for turbulence. The weak forms of the volume‐averaged governing equations are solved using a multi‐frontal solver combined with UMFPAC...

The study deals with the quantification of computational demands of predicting volume-averaged multi-size particulate flow in rotating 2D channels using Galerkin finite element method. The performances of multifrontal (UMFPACK 4.4) direct solver and preconditioned recursive Generalised Minimum Residual (GMRES) solver are compared. For problems with...

The objective of the present work is to (i) study the influence of different model lift coefficients, (ii) evaluate the importance of particle rotation, and (iii) compare the present computed results with two-way coupling results (in open literature) on the particle trajectory in dilute two-phase gas-solid horizontal channel flow. A hybrid Eulerian...

In this study, the expected particle trajectories and concentration distributions in a 2D slurry pump casing are investigated using the discrete phase modeling (DPM) module in FLUENT 6.1 ®. Two-way coupling between the carrier-phase and dispersed phase is considered. First order upwinding and segregated solver in double precision mode are adopted f...

The objective of the present work is to study the effect of different model lift coefficients on the particle trajectory in dilute two-phase gas-solid horizontal channel flow. Five different model lift coefficients are selected from the open literature. A hybrid Eulerian-Lagrangian method is employed to study the dilute two-phase gas-solid flow in...

Galerkin Finite Element Method with Q<sub align="right"> 1 </sub>Q<sub align="right"> 0 </sub> (bilinear velocity-constant pressure) elements is shown to efficiently and reliably solve the elliptic equations governing developing mean flow in a channel rotating in orthogonal mode. This approach departs from the (partially) parabolic finite volume me...

Galerkin Finite Element Method with Q(1)Q(0) (bilinear velocity-constant pressure) elements is shown to efficiently and reliably solve the elliptic equations governing developing mean flow in a channel rotating in orthogonal mode. This approach departs from the (partially) parabolic finite volume methods previously used in the literature for this c...

Traditionally, rotation-modified higher order turbulence models are used in simulation of flow through rotating channel. In modeling two-phase flow, prediction of the corresponding single-phase flow is usually an important pan of the overall iteration process. Thus, every effort is made to reduce computation time during this part of the solution. W...

The problem of particulate flow in rotating channels serves as a useful benchmark for the more complex problem of solid-fluid mixtures in rotating passages. In a previous paper, the authors reported numerical simulation of the developing, two-dimensional (valid for large aspect ratio channels), steady (in the mean) and incompressible carrier-phase...

The basic intent of the present work is to evaluate the potential of using a clean-burning fuel such as hydrogen for small horsepower spark ignition engines. Since compressed natural gas (CNG) has already been used as an alternative fuel for internal combustion engines, an effort has been made in the present work to compare hydrogen fuelling with C...

This paper discusses the development of an electronically controlled gas injection system for a hydrogen-fuelled spark ignition engine. In view of its typical combustion characteristics the mode of fuelling plays a critical role for practical operation of a hydrogen engine. The system developed should have adequate flexibility to provide the approp...