Rakesh Mishra

University of Huddersfield · Department of Engineering and Technology

In the present paper modified models for the prediction of pressure drop and velocity field in the flow of multi-sized particulate slurries through circular pipes have been presented. The two layer model for pressure drop prediction proposed by SHOOK and his co-workers has been modified by incorporating easily measurable parameters like static sett...

NOx is one of the major toxic emissions that needs to be regulated stringently in both EU and USA emission regulations. The engine designer is keen to get an accurate, reliable and cost effective NOx measurement system. In this paper, the application of the cylinder pressure for predicting the NOx emission of compression ignition (CI) engine fuelle...

Road vehicles tend to be more vulnerable to accidents especially at motorway speeds. Commercial vehicles in particular are more prone to overturning accidents due to adverse conditions like cross winds and abrupt acceleration/braking conditions. Thus, it is essential to investigate vehicle stability under various conditions of manoeuvring, cross wi...

A methodology has been developed to determine the optimal size and lifetime of pipelines transporting multi-sized solid-liquid mixtures. The methodology includes a model for prediction of various life-cycle costs for the flow of multi-sized particulate solid-liquid mixtures in a pipeline. The particle size distribution effects have been incorporate...

The wear characteristics of three types of long radius pipe bends in the flow of multisizcd particulate slurries have been extensively studied.Conventional long radius bend, and two types of diverging-converging bends are investigated. MeasuremenLs have been made over a range of solid concentrations and flow velocities. The results have shown that...

This paper considers the stability of a thin film propagating beneath a large quantity of ambient static non miscible lighter liquid and over a sloping plane. Such configuration that has never been considered earlier can model the spill of a heavy hydrocarbon into the ocean by a tanker. Equations of conservation of the mass and the momentum were ap...

Combustion of hybrid natural gas (methane) and hydrogen mixture in domestic swirl stoves has been characterized using hot-state experiments and numerical analysis. The detailed combustion mechanism of methane and hydrogen (GRI-Mech 3.0) has been simplified to obtain reduced number of chemical reactions involved (82 % reduction). The novel simplifie...

Augmented reality (AR) is a promising technology for supporting industrial maintenance applications. Two major types of AR technology are used for maintenance applications. One of those is AR remote maintenance, a technology that connects remote experts to on-site technicians to work collaboratively on industrial maintenance applications. This seem...

The present paper aims to evaluate the local scouring of non-cohesive sediment beds consisted of uniform sediment particles downstream of a D – type piano key weir in steady flow condition. The experiments were conducted for one model of D - type piano key weir with five keys. Accordingly, the effect of hydraulic parameters was examined on scouring...

Infrastructure, including roads, bridges, and municipal facilities, act as barriers to the downstream propagation of flood waves following a dam failure. The aim of this work is to investigate the effects of the obstacles and their arrangement on the evolution of flood waves during a dam breach using a numerical approach. The obstacles were arrange...

When designing control valves for multiphase applications using conventional valve sizing methodologies, it is assumed that the flow properties such as mixture density and volume fraction of phases are uniform throughout the valve trim. In reality, however, the properties may be different due to the difference in the gas and liquid densities as wel...

Kitchen waste and tree branches are two of the most common solid waste materials suitable for on-site disposal. Quantification of combustion characteristics of these waste materials is vital for designing an appropriate incinerator. In this paper, the combustion characteristics of a mixture of kitchen waste and tree branches have been analyzed. As...

Multi-tube multi-fin heat exchangers are extensively used in various industries. In the current work, detailed experimental investigations were carried out to establish the flow/heat transfer characteristics in three distinct heat exchanger geometries. A novel perforated plain fin design was developed, and its performance was evaluated against stan...

Prior to full electric conversion, internal combustion engines will still maintain a paramount position in heavy goods and earth-moving vehicles. The most promising, cleaner alternative to fossil fuels is biodiesel. While it does not require alterations in the engine design, hence no major overhaul of existing infrastructure, biodiesel is more sust...

In December 2019, the SARS-CoV-2 virus emerged and rapidly spread throughout the world. It causes the respiratory disease COVID-19 via the transmission of microbial pathogens within bio-aerosols during speaking, sneezing, and coughing. Therefore, understanding bioaerosol dynamics is important for developing mitigation strategies against droplet-ind...

Air caps are an effective way of ensuring uniformity of air flow in Circulating Fluidized Bed (CFB) boilers. Published literature on the design and configuration of these air caps is severely limited. In this study, extensive theoretical as well as experimental investigations have been carried out to design novel air caps in order to improve effici...

Channel junctions are an integral part of any channel network. The flow passing through different channel elements is a necessary hydraulic parameter required to be estimated. This paper presents a methodology for predicting the flow rate through different components of a sub-critical combining and dividing channel junction. The methodology propose...

Hydropower is a continuously renewable electrical energy source. Small scale hydropower systems capture the energy in flowing water and convert it to usable energy. It can provide cheap, clean and reliable electricity. This article introduces strategic fit applications of Small Hydroelectric Project (SHEP) to replace fossil fuels in hilly regions....

The complex flow features of combining and dividing channels have been analysed in the present study. The theoretical model developed is versatile and can be used for any combinations of junction angles and width ratios of the branch channels to the main channel. The prediction of the models has been validated from the data available in the literat...

India's hydropower sector has not made the progress it should have made to tap the abundant potential available in the country. In fact, it has miserably lagged behind the other sectors Hydropower is a continuously renewable electrical energy source. Small scale hydropower systems capture the energy in flowing water and convert it to usable energy....

This paper facilitates the integration of TRIZ and CFD techniques to resolve design challenges and drive innovation in flow handling equipment new product development processes. A new methodology is proposed based on an integrated product lifecycle suited for flow handling equipment product development processes. The methodology accomplishes novel...

For safety-critical industrial applications, severe-service valves are often used, and the conditions during operations can be either single phase or multiphase. The design requirements for valves handling multiphase flows can be very different to the single-phase flow and depend on the flow regime within valves. The variation in flow conditions du...

New simulation and experimental results have been obtained and are presented for a multi-tube fin heat exchanger unit, from which semi-analytical correlations for the Fanning friction and Colburn factors were developed. The multi-tube and fin heat exchanger represents the main component of the Fan Coil Unit, an essential component of HVAC systems u...

The combustion characteristics of Mixed Municipal Solid Waste (MMSW) play a vital role in dictating the efficiency of the incineration process. At present, few studies on combustion characteristics of three components MMSW and the establishment of corresponding comprehensive kinetic model of single component waste have been reported. In the present...

Cavitation is a problem that occurs in any pump and contributes highly towards the deterioration in the performance of the pump. In industrial applications, it is vital to detect and minimize the effect of cavitation in pumps. The use of various techniques, such as vibration analyses, can provide a more robust detection of cavitation in the pump. I...

Control valves that are used in severe service applications have trim cages that are geometrically quite complex. Most of these trims are manufactured using traditional manufacturing methods which are expensive and time-consuming. In order to reduce manufacturing costs and shorten the product development cycles, Additive Manufacturing (AM) methods...

Most manufacturing companies in capital goods industries sell their products on a worldwide scale and must cope with several challenges to provide field services to distant customers. Mobile collaborative augmented reality (MCAR) provides a new way of servicing distant customers by enabling real-time collaboration between on-site technicians and re...

The introduction of platforms disrupted many consumer industries. Prominent examples include Amazon, Airbnb, and Uber, who upended their respective industries. Eventually, platforms will also enter capital goods industries and their downstream service businesses. A part of these downstream businesses in capital goods industries are field services....

Control valves used in energy systems are often integrated with trims having well designed flow paths to regulate fluid flow. These trims, known as multi-stage continuous-resistance trims, comprise of staggered arrangement of circular cylinders enabling pressure drop reduction in controlled stages. The trim design process currently used doesn't ens...

A methodology is developed to determine the shape of the two dimensional section of wind turbine blades considering the operation of wind turbine under icing conditions. An inverse design process provides the blade shape from a prescribed pressure or velocity distribution, and then the icing of the blade section obtained is simulated under differen...

Control valves are an integral part of a number of energy systems, such as those used in chemical and nuclear industries. These valves are used to regulate the amount of fluid flow passing through these systems. A key component of a control valve is its trim, which in case of a multi-stage continuous-resistance trim consists of a staggered arrangem...

Maintenance services provided by Original Equipment Manufacturers (OEMs) play a fundamental role in industrial asset management. The vast majority of OEMs provide maintenance services to their customers, as most customers now outsource complex maintenance tasks. For many OEMs the economic value of operations has even shifted from manufacturing trad...

The present paper is concerned with the flow of a micropolar/Eringen fluid sandwiched between two Newtonian fluid layers through a horizontal porous channel. The flow in both regions is steady, incompressible and the fluids are immiscible. The flow is driven by a constant pressure gradient and a magnetic field of uniform strength is applied in the...

In this thesis, a global framework for design and optimisation was developed taking into account overall costs of design, manufacturing and operation. Full 3D CFD models of multi-tube and fins heat exchanger were developed to investigate complex and non-uniform flow on water and air sides of the device. The CFD models were developed to enable local...

Tractor–trailer units are integral part of the heavy commercial vehicle industry, used globally for goods transportation. Manufacturers have been trying to design aerodynamically efficient tractor–trailer units to reduce ever increasing fuel costs. In order to investigate the aerodynamic response of tractor–trailer units, the aerodynamic forces and...

Multistage severe service control valves are extensively used in various energy systems, such as oil & gas, nuclear etc. The primary purpose of such valves is to control the amount of fluid flow passing through them under extreme pressure changes. As opposed to the conventional valves (butterfly, gate etc.), control valves are often installed in en...

It is well established that under gusty crosswind conditions, vehicle aerodynamic forces can lead to sudden changes in vehicle dynamics and stability. Large class vehicles, in particular, are more prone to rollover accidents in strong crosswind situations, especially at cruising speeds. It is therefore essential to conduct detailed investigations o...

Purpose Use of fossil fuels in automotive sector is one of the primary causes of greenhouse emissions. The automotive engines need to perform at their best efficiency point to limit these emissions. Most of the quality indicators in this regard are based on near steady state global operational characteristics for engines without considering local...

Centrifugal pumps are very common in many fluid handling industrial applications, such as petrochemicals, oil and gas, etc. Although the design practices for centrifugal pumps are well established, efforts are directed towards optimising such systems for better operational efficiencies. In order to optimally design centrifugal pumps, it is benefici...

Friction Stir Welding (FSW) is a solid-state welding process that uses a rotating and translating tool to weld two materials together. The current study has been carried out in order to simulate the complex flow phenomena associated with FSW with much more realistic modelling. For this purpose, dynamic mesh has been used to simulate the translation...

It is well established that inlet flow characteristics may affect the performance of fluid handling systems considerably. This work focuses on the local flow analysis of a severe service control valve with a continuous resistance trim (CRT) operating under multiphase flow conditions and the effect of the inlet flow characteristics on the dispersed...

The effect of manufacturing method induced roughness on severe service control valve performance Original Citation Charlton, Matthew, Mishra, Rakesh and Asim, Taimoor (2016) The effect of manufacturing method induced roughness on severe service control valve performance. Abstract There are a number of manufacturing methods used for the manufacture...

In this study, experimental and numerical investigations on the response a multi tubes and fins heat exchanger under steady state operating conditions have been carried out. A test setup has been developed in order to study the heat transfer and pressure drop characteristics of this heat exchanger. In accordance with the heat exchanger used for exp...

Use of blended learning system in a structured manner results in achieving higher order skills in cognitive domain. However, there is a need to quantify skills improvements as the students go through lower level skills to higher level skills. To ascertain this progression, it is necessary to develop a mathematical model of learning which can indica...

The testing of assemblies for use in cryogenic systems commonly includes evaluation at or near operating (therefore cryogenic) temperature. Typical assemblies include valves and pumps for use in liquid oxygen-liquid hydrogen rocket engines. One frequently specified method of cryogenic external leakage testing requires the assembly, pressurized with...

The scarcity of fossil fuels is affecting the efficiency of established modes of cargo transport within the transportation industry. Efforts have been made to develop innovative modes of transport that can be adopted for economic and environmental friendly operating systems. Solid material, for instance, can be packed in rectangular containers (com...

The technology based learning systems have capability to comply with diverse requirements of all the stakeholders in the modern education system. In technology based modules, such as those taught in Mechanical Engineering courses, the psychomotor content takes precedence over other domains of teaching and learning. Effective integration of pedagogi...

Rapid depletion of energy resources has immensely affected the transportation sector, where the cargo transportation prices are rising considerably each year. Efforts have been made to develop newer modes of cargo transportation worldwide that are both economical and efficient for a long time. One such mode is the use of energy contained within flu...

The scarcity of fossil fuels affects the efficiency of established modes of cargo transport within the transportation industry. Extensive research is being carried out on improving the efficiency of existing modes of cargo transport, as well as developing alternative means of transporting goods. One such alternative method is using energy contained...

Industrial control valves often handle flows with very high pressure drops (conditions often referred to as severe service). In order to cope with these pressure drops, geometrically complex valve trims with many stages of pressure loss, are designed to prevent undesirable side effects such as cavitation, excessive noise or erosion. These effects a...

Computational Fluid Dynamics (CFD) is a very effective tool to analyse the flow characteristics within and around different mechanical artifacts such as automotive vehicles, turbomachines etc. CFD based analysis provides beneficial information about the flow behavior within a component, hence reducing the costs involved in the design process of tha...

One of the most important sources of renewable energy is solar energy, which is readily available throughout the world. There is a requirement to make the solar energy affordable for everyday use in order to minimise the present reliance on fossil fuels. This would also assist in meeting the requirements of limiting greenhouse-gas effects, and henc...

One of the most important sources of renewable energy is solar energy, which is readily available throughout the world. There is a requirement to make the solar energy affordable for everyday use in order to minimise the present reliance on fossil fuels. This would also assist in meeting the requirements of limiting greenhouse-gas effects, and henc...

One of the most important sources of renewable energy is solar energy, which is readily available throughout the world. There is a requirement to make the solar energy affordable for everyday use in order to minimise the present reliance on fossil fuels. This would also assist in meeting the requirements of limiting greenhouse-gas effects, and henc...

Centrifugal pump is one of the most widely used devices to transport fluids in industries and buildings. A lot of research has been carried out to make it more efficient. With the development of Computational Fluid Dynamics (CFD), the parametric study of a centrifugal pump has become much easier and the complex internal flow can be well predicted...

Solar energy is one of the main sources of renewable energy that is abundantly available throughout the world. Solar energy can be used for useful purposes through a number of mechanical artefacts. One such artefact is known as Thermo-syphon, which typically contains water as its working fluid. One of the major applications of Thermo-syphon is with...

Effect of solar heat flux and thermal loading on the flow distribution within the riser pipes of a closed­loop solar thermo­syphon hot water system Original Citation Freegah, Basim, Asim, Taimoor and Mishra, Rakesh (2015) Effect of solar heat flux and thermal loading on the flow distribution within the riser pipes of a closed­loop solar thermo­syph...

In this study the diagnosis of the flow of two centrifugal pumps has been carried out. The efficiencies, which are measured through experimentation, are different for two centrifugal pumps of same type during same flow conditions. By the help of the current transducers (LA-55P), capturing the consumption of current of the induction motor which is t...

Centrifugal pump is one of the most widely used devices to transport fluids in industries and buildings. A lot of research has been carried out to make it more efficient. With the development of Computational Fluid Dynamics (CFD), the parametric study of a centrifugal pump has become much easier and the complex internal flow can be well predicted t...

Environmental degradation has come about for a number of factors including the use of fossil fuels in vehicles for everyday use. This paper attempts to understand the relationship between fuel consumption and various engine performance parameters under laboratory conditions in order to see how various factors contribute to the overall fuel consumpt...

There are many social, political and environmental issues associated with the use of fossil fuels. For this reason, there are numerous investigations currently being carried out to develop newer and renewable sources of energy to alleviate energy demand. Wind is one source of energy that can be harnessed using wind turbines. In this study, numerica...

Trains are considered to be the safest on-land transportation means for both passengers and cargo. Train accidents have been mainly disastrous, especially in case of fire, where the consequences are extensive loss of life and goods. The fire would generate smoke and heat which would spread quickly inside the railway compartments. Both heat and smok...

Computational Fluid Dynamics (CFD) is a very effective tool to analyse the flow characteristics within and around different mechanical artifacts such as automotive vehicles, turbomachines etc. CFD based analysis provides beneficial information about the flow behavior within a component, hence reducing the costs involved in the design process of tha...

Trains are considered to be the safest on-land transportation means for both passengers and cargo. Train accidents have been mainly disastrous, especially in case of fire, where the consequences are extensive loss of life and goods. The fire would generate smoke and heat which would spread quickly inside the railway compartments. Both heat and smok...

In this study the diagnosis of the flow of two centrifugal pumps has been carried out. The efficiencies, which are measured through experimentation, are different for two centrifugal pumps of same type during same flow conditions. By the help of the current transducers (LA-55P), capturing the consumption of current of the induction motor which is t...

Abstract In this paper, experimental and numerical analyses of bubbly air-water flow in a vertical pipe at low volumetric flow rates has been carried out to quantify the effect of swirl on void fraction profiles. These investigations have been carried out at a dispersed phase volume fraction of 0.051% and at superficial flow velocities of 0.041 m/s...

Enhancing the aerodynamic efficiency of commercial vehicles is gaining increasing importance as it helps to reduce both overall fuel consumption as well as emissions. This paper investigates the advantages offered by a novel fuel-saving device for such vehicles. This device uses a moving surface to impart additional kinetic energy to flow near the...

Centrifugal pumps play an essential role in engineering systems since they are widely used in the process and power industries. The performance of a centrifugal pump needs to be maximised due to its importance and this depends on the flow structure within the pump. The flow structure within a pump is very complex due to the presence of a rotating i...

Centrifugal pumps play an essential role in engineering systems since they are widely used in the process and power industries. The performance of a centrifugal pump needs to be maximised due to its importance and this depends on the flow structure within the pump. The flow structure within a pump is very complex due to the presence of a rotating i...

In this paper, use of Proportional-Integral (PI) controller to monitor and control liquid level in an interconnected CE 105 model coupled tank is investigated. To achieve a system which can instantaneously and accurately control the liquid level in a coupled tank, two different PI controllers have been tested. The LabVIEW library for the PI control...

been carried out in renewable energy area to minimize the dependency on the fossil fuels. There are several energy sources naturally available, and solar energy is considered to be the best amongst them. Therefore it became a motivating area for the researchers in recent years. Thermo-syphon is one of many devices that use solar energy for power ge...

Environmental degradation has come about for a number of factors including the use of fossil fuels in vehicles for everyday use. This paper attempts to understand the relationship between fuel consumption and various engine performance parameters under laboratory conditions in order to see how various factors contribute to the overall fuel consumpt...

The pump design and complex internal flow analysis has been greatly enhanced by the development of computational fluid dynamics. The computational simulation helps us to obtain data at positions where experimentation is not possible. There are various parameters that affect the pump performance such as impeller outlet diameter, blade angles and bla...