A. S. Dhoble

• Doctor of Philosophy
• Professor (Assistant) at Visvesvaraya National Institute of Technology

Electric motor is a critical component of an electric vehicle, and proper thermal management is essential for its efficient and reliable operation. As the electric vehicle industry continues to evolve, there is a growing demand for electric motors that can deliver superior performance and high efficiency. These motors are expected to be more powerf...

The study aims to investigate the performance of a thermal management system for lithium-ion batteries in electric vehicles (EVs) by utilizing a helical coiled pulsating heat pipe (HC-PHP) combined with a hybrid nanofluid consisting of Al2O3–MWCNT–ethylene glycol. The experimental investigation focuses on evaluating the effectiveness of this system...

The initial part of the given study involves numerical studies on the automotive underhood aero-thermal phenomena with a simple car model and a heat source fixed to it under the hood. As a further extension of the generic case, the second part involves numerical simulation of the same car model with a diffuser for the cooling improvement of the bat...

One of the most recent fields to emerge in this era of a sustainable energy revolution is energy storage in batteries. These days, electric vehicles use batteries more than ever. Lithium-ion batteries stand out as exceptional energy storage devices in this context and have been widely used due to their multiple impressive advantages. However, lithi...

Lithium-ion battery, the indispensable part of electric vehicles or hybrid electric vehicles because of their high energy capacity and power density but usually suffer from a high temperature rise due to heat generation within a battery. This heat generation is mainly a function of the state of charge and charge/discharge rate. A passive technique...

A cooling technology like phase change material has been recognised as a promising approach due to its sustainable life span and high latent heat without any need of pumping power like in the air or liquid cooling. It can be made in passive or semi-passive mode, owing to which it is compact, lightweight, efficient and safe. However, it usually suff...

The use of fins for the passive mode of heat transfer enhancement is being used since decades. The use of fin increases the rate of heat transfer by increasing the effective area available for the energy exchange. Hence, most of the modern heat exchanger makes use of different types of the fins to make the device more efficient and compact. Most of...

Cross flow tube bank is an important constituent in most of the industrial heat exchanging systems such as Heating Ventilation and Air Conditioning (HVAC) systems, Waste Heat Recovery systems and Industrial Boilers. Considering the depletion of fossil fuels and allied environmental concerns, there is a huge need for improving the performance of the...

An experimental examinations has been conducted on an inclined top and side heating mode phase change material (PCM) filled rectangular enclosure to understand its applicability in various thermal applications like: photovoltaic (PV) thermal management systems, concentrated PV systems, building thermal management and so on. The basic objective of t...

In the present research work, heat transfer and friction characteristics of in-line elliptical tubes are studied experimentally and numerically with the aiming to enhanced the thermal performance. The elliptical tubes with an aspect ratio (AR) of 0.35 and 0.50 and with circular tubes of the aspect ratio of 1 are selected for Reynolds number (Re) ra...

The cross-flow heat exchanger is a special type of heat exchanger involving the exchange of heat in the case of two fluids flowing in an orthogonal direction. The heat exchanger often comprises of a number of cylinders carrying hot fluid, along with the colder fluid flowing across/over the tubes or cylinders. The system also comprises of additional...

Purpose The purpose of this paper is to predict and optimize the width of heat affected zone (HAZ) with better mechanical properties using suitable welding process and parameters for the fabrication of jet blast deflector (JBD) (high strength low alloy material of grade A588-B was used for fabrication) so that the JBD can sustain high exhaust param...

The use of passive mode of heat transfer enhancement are most commonly used for the performance improvement with conservation of conventional fuels. In recent times, to visualize the insight of fluid flow analysis, the numerical simulations are mostly preferred. The number of grid points present in the in the fluid domain near the wall governs the...

The thermal efficiency of the solar air heater (S.A.H.) is enhanced by introducing various artificial roughness geometries on the absorber surface. Artificial roughnesses in the form of a chamfered rib, right angle triangular and reverse L-shaped ribs, invented from square rib are presented. A comparative thermohydraulic analysis of these ribs is c...

Heat transfer and fluid flow characteristics in roughened solar air heater duct with combined square and equilateral triangular ribs as roughness is investigated using experimental and computational fluid dynamics (CFD) approaches. Relative roughness pitch (7.14 ≤ P/e ≤ 17.86), roughness height (e/D = 0.042), Reynolds number (3800≤ Re ≤ 18,000) and...

The passive mode of enhancement in the heat transfer applications has been widely used since decades. The method is more popular due to the non-requirement of any prime mover for energy interaction. The fluid flow interaction in any heat exchanger defines the thermal performance of the device. The cross-flow heat transfer experiences the flow throu...

The purpose of this paper is to analyze the modern deep neural networks such as nonlinear autoregressive network with external inputs and a recurrent neural network called long short-term memory for wind speed forecast for long-term and use the prediction for fatigue analysis of a large 5 MW wind turbine blade made of composite materials. The use o...

Combined solar photovoltaic-thermal systems (PVT) facilitate conversion of solar radiations into electricity and heat simultaneously. A significant amount of work has been carried out on these systems since 1970. Different PVT systems have been invented in the last thirty years. Several theoretical, mathematical, numerical and experimental models a...

The applicability of phase change materials (PCMs) for the thermal management of low concentrated photovoltaic systems is explored in the current research work. Extended surfaces on the back surface of the PCM container are proposed with its small portion extruded to the outside. PCM thicknesses of 80 mm, 100 mm, and 120 mm are investigated, and an...

The use of advance composite materials is increasing in various industrial applications such as renewable energy, transportation, medical devices, etc. As the demand for stability under high mechanical, thermal, electrical and combined loads is increasing, research is being focused on developing newer types of composites and developing analytical a...

The paper reports use of silicone oil as spectrum filter and heat absorber for photovoltaic thermal systems. The terrestrial solar spectrum is in the wavelength range of 0.25 to 2.5 μm. The response range of C-Si solar cell is 0.75 to 1.125 μm. In the current study, the feasibility of Silicone oil (Transformer oil) as spectrum filter cum heat absor...

Jet blast impact on aerofoil blade of the deflector is studied which redirects the high energy exhaust of jet engine during the ground testing. The geometric model of aerofoils is designed with structured mesh around the aerofoil in rectangular domain generated in ICEM 16 software. The jet blast impact on aerofoil blade of the deflector is numerica...

The solar photovoltaic thermal system (PVT) facilitates conversion of incoming solar radiations into heat and electricity simultaneously. The beam split photovoltaic thermal system (BSPVT) is one of the PVT systems. In this system, the incoming solar beam is splitted and used separately for PV and thermal system. The feasibility of water, silicone...

The purpose of this article is to analyze various wind speed-forecasting methods, select the appropriate method for developing synthetic wind speed for 1-year period at Salem in Tamilnadu state in India, and use it for the structural and fatigue analysis of a small horizontal-axis wind turbine blade made of composite material. Various forecasting m...

Abstract: Due to ever increasing simultaneous demand of heat and electricity globally, Photovoltaic thermal (PVT) system comes out as an essential research area in recent years. Integration of photovoltaic (PV) and thermal system in a single unit, improves PV cell efficiency and produces low grade heat. Researchers are working on optimization of th...

Microstructure, mechanical properties and corrosion resistance of dissimilar friction stir-welded aluminum and magnesium alloys were investigated by applying three different rotational speeds at two different travel speeds. Sound joints were obtained in all the conditions. The microstructure was examined by an optical and scanning electron microsco...

Tube bank heat exchangers are considered to be an effective device for heat transfer between two fluids. Researchers investigated various arrangements and along with different geometries of the tube, so as to improve the thermal performance of the tube bank. In the present study, the numerical investigation is carried out to determine the thermal p...

In the current study, the performance of a photovoltaic thermal system with easily available and less expensive liquids as spectrum filters is analyzed. The absorption and transmission spectrum of different liquids is investigated using a UV–VIS–NIR spectrophotometer for the wavelength range of 200–2500 nm (terrestrial solar spectrum). Among all th...

In this research work a setup is designed to incorporate Lauric acid as a phase changing material (PCM) in a solar air heater. This phase changing material (PCM) is carefully selected based on the application and manufacturing constraints. A thermal energy storage device (TESD) is manufactured and incorporated in solar air heater and experiments we...

The experimental and the three-dimensional numerical simulation of cross flow tube bank in staggered arrangements with and without the splitter plate attachment is performed with (5500 ⩽ Re ⩽ 14,500) and splitter plate length to tube diameter (L/D) ratio as 1. The longitudinal and transverse tube pitch ratio SL/D and ST/D were maintained constant a...

Magnetic binary oxide particles (MBOP) were prepared by template method using chitosan in the laboratory for the removal of As(III) from water. The prepared MBOP has super paramagnetic property which is sufficient for magnetic separation. Column study was performed at two different flow rates of 2.0 ml/min. and 5.0 ml/min and comparison was made wi...

A solar air heater is a thermal system which uses artificial roughness in the form of repeated ribs on the absorber plate to enhance the heat transfer rate. Forced convection heat transfer of air in a solar air heater with reverse L-shaped ribs has been carried out experimentally and numerically. Thermal performance of solar air heater is studied w...

Mathematical modeling and simulations are seen as vital methodologies to predict the thermal performance optimization of thermal systems. Solar air heater roughened with 20° angled rib is simulated using an algorithm developed in MATLAB to predict the optimal set of design and operating parameters. Correlations developed using second order polynomi...

A solar air heater is experimentally investigated by many researchers to study the effect of operating and geometrical parameters on heat transfer and fluid flow characteristics. The availability of highly advanced computer hardware and development in numerical methods, encouraging the future researchers to carry out the simulations of solar air he...

An experimental and two-dimensional computational fluid dynamics (CFD) analysis of a solar air heater has been carried out using right-angle triangular ribs as artificial roughness on the absorber plate as a convenient method for enhancement of thermal performance of solar air heater. The relative roughness pitch (P/e = 7.14–35.71), Reynolds number...

In the spectrum beam split approach of combined solar photovoltaic thermal system (PVT), the complete solar spectrum is splitted. The unwanted part of the solar spectrum for photovoltaic (PV) applications is filtered out and is used separately as heat. In this work, some inexpensive, clear, and easily available selective fluids are identified which...

An experimental and two-dimensional computational fluid dynamics (CFD) analysis of a solar air heater has been carried out using right-angle triangular ribs as artificial roughness on the absorber plate as a convenient method for enhancement of thermal performance of solar air heater. The relative roughness pitch (P/e = 7.14–35.71), Reynolds number...

The nanofluids are widely used for heat transfer applications in the various engineering applications. The nanoparticles dispersed uniformly in the base fluid on proper mixing. In the present study, Al2O3 and CuO nanoparticles were selected and the changes in the heat transfer coefficient were investigated in the complete laminar and discrete point...

CFD analysis of 2-dimensional artificially roughened solar air heater duct with additional circular vortex generator, inserted in inlet section is carried out. Circular transverse ribs on the absorber plate are placed as usual. The analysis is done to investigate the effect of inserting additional vortex generator on the heat transfer and flow fric...

The performance characteristics of a solar heater and heat exchangers can be effectively improved by using artificial roughness in different forms, shapes and sizes. Artificial roughness is provided in the form of different geometries such as ribs, dimple shape roughness, wire mesh, baffles, delta winglets etc. To determine the effect of these geom...

For high degree of engine performance, it is imperative that all critical parts are designed and optimised through durability assessment. The conventional engine development programme based on actual engine test on test bed is time consuming and expensive, and is being replaced by use of simulation tools and accelerated component testing. The prese...

Continuously increasing stringency of emission legislation such as Euro 2 and Euro 3 require the Engine Designer and Manufacturer to strive for further reduction in lubricating oil consumption. Increased customer expectation, depletion of natural resources and increase in competition are also other drivers to focus on oil consumption reduction. In...

As the emission standards have become stricter, in recent years, the diesel engine technology has continued to advance rapidly in the field of emission control. The focus of engine industry research and development is on reducing the engine out emissions CO, HC, NOx and particulate matter (PM). The particulate matter in the air has become the subje...

The finite element (FE) analysis technique is commonly used tool for analyzing the orthopedic biomechanics problems. In case of the finite element analysis of the bio-structure the mean values of the properties are considered for estimating the response of the system to the applied load. Since the biological systems are inherently variable in natur...