Ravi Sharma

Manipal University Jaipur · Mechanical Engineering

In this work, biochar was synthesized by carbonizing spent coffee grounds by conducting oxygen-limited pyrolysis in a muffle furnace. Six varieties of biochar have been synthesized at 550 ℃ and 750 ℃ with a ramp rate of 10 ℃/min and carbonization time of 120 min. Acid- and alkali-activated biochars were produced by carbonizing the activated biomass...

Engineers are finding more and more uses for sophisticated electrostatic nano-coatings. This new information prompted us to look into the theoretical and computational aspects of an unsteady EMHD incompressible two-dimensional heat-transfer tangent hyperbolic ternary hybrid nanofluid boundary layer coating flow outside of a two-dimensional porous w...

Recently, great effort has been made towards the preparation of seepage-free composite phase change materials for advanced thermal energy storage (TES) systems. Within this context, in this study, shape stabilized microcrystalline cellulose (MCC)/methyl stearate (MtS)/graphene nanoplatelet (GnP) composites as novel heat storage materials were produ...

The ability to store high latent heat energy makes polyethylene glycol (PEG) one of the most promising materials in the organic phase change material (PCM) family. Nevertheless, poor heat conductivity limits its potential to a large extent in real time applications. In this study, polyethylene glycol (PEG2000) was incorporated with nano aluminium o...

The effectiveness of Gypsum plaster loaded with Shape Stabilized Composite Phase Change Material (SSCPCM) in regulating indoor temperature of the building is experimentally investigated in this study. SSCPCM is composed of Gypsum/Lauric acid/Zeolite loaded with varying percentage of Graphite (0 wt%, 5 wt%, and 10 wt%). The SSCPCM-0, SSCPCM-5, and S...

Solar energy is accessible freely and can be utilized for many household and industrial applications. The consumption of solar energy for cooking applications has found significant success. Various innovations have been employed in facilitating cooking during off-sunshine hours. Thermal energy storage helps in overcoming the fluctuations in the sup...

The present work outlines the development of eutectic phase change material in different mass fraction ratio and determining its thermal properties. The eutectic mixture was prepared by using polyethylene glycol (PEG) of atomic weight 10 000 and 6000. The eutectic was prepared by using single-step stirring and blending methods. Phase transition tem...

This study shows the effect of integrating eutectic Phase Change Material (PCM) in concrete on thermal, physical, and mechanical properties. Lauric acid and Myristic acid were used to prepare Eutectic PCM. Eutectic PCM was mixed in Zeolite to form Shape Stabilized Composite Phase Change Material (SSCPCM). SSCPCM-39% was found to be most stable and...

The latent heat thermal energy storage (LHTES) systems using organic phase change materials (PCMs) offer significant advantages, however, they suffer with low thermal conductivity and this limitation restricts their uses in many real applications. This weakness of them has attracted the attention of worldwide researchers. In the present work, a nov...

Solar energy is accessible freely and can be utilized for many household and industrial applications. The consumption of solar energy for cooking applications has found significant success. Various innovations have been employed in facilitating cooking during off-sunshine hours. Thermal energy storage helps in overcoming the fluctuations in the sup...

The form-stabilization ability of the produced graphitic carbon nitride (g-C3N4) for preventing the leakage of stearyl alcohol (SAOH) as promising organic phase change material (O-PCM) was investigated comprehensively. The SEM analysis showed that the g-C3N4 had well defined pores which is capable to confine the molten SAOH in them. The FTIR and XR...

This paper thoroughly reviews the development and characterization of carbon-based form stable organic phase change materials (FS-OPCMs) for latent heat storage applications. The O-PCMs such as paraffin, fatty acids, polyethylene glycols (PEGs), etc., suffer from poor thermal conductivity and flow ability in their molten state, which restricts thei...

The ability to store latent heat thermal energy makes polyethylene glycol (PEG) one of the most promising PCMs in the organic phase transition family. Nevertheless, the poor heat conductivity limits it potential to some extent in the real time applications. In this study, polyethylene glycol (PEG2000) was incorporated with nano aluminium oxide (Al2...

Fluid flow across parallel plates has been involved in a variety of commercial and technological applications which have continuously been attracting the interest of the researchers. This chapter presents an approach to investigate electromagnetohydrodynamics (EMHD) squeezing flow of viscous ternary composite nanofluid (Al2O3 (spherical), silicon d...

Thermal energy storage using nano materials as PCMs is a promising technology for generating low cost dispatchable electrical energy form solar power system. In this paper, synthesis of Cu based nano PCMs for thermal storage applications have been investigated. The nano copper particles are dispersed into the base fluid (PEG) in different weight pe...

Solar energy is best suited substitute energy source owing to its cost-effectiveness and eco-friendly nature. But, the irregular nature of solar energy limits its usage and efficacy in domestic and industrial applications, particularly for water heating. Various research reports demonstrated that increasing convective heat transfer rate and energy...

The rate of energy consumption has been increasing in the recent years with the expanding population. Renewable energy sources have been centre of attention for many researchers around the globe, since they are available abundantly. Solar thermal energy storage systems accumulates energy from the solar field, using a phase change material. Organic...

Power shortage is a multifaceted problem of the developing nations. Due to the energy crisis, India, one of the Asia’s key economies is experiencing power shortages. During the recent years, electricity demand has gone up while there is a crunch in coal inventory at the thermal power plants. Therefore augmenting resources from solar energy to nucle...

Energy utilization for cooking needs is basic and foremost end use in developing countries. Growing population and depletion in natural resources urges to find the alternate energy sources. Solar energy is available in abundance for free and can be an excellent source for cooking needs. Various types of solar cooking appliances are developed across...

Modern lubrication systems are increasingly deploying smart (functional) materials. These respond to various external stimuli including electrical and magnetic fields, acoustics, light etc. Motivated by such developments, in the present article unsteady electro-magnetohydrodynamics (EMHD) squeezing flow and heat transfer in a smart ionic viscous fl...

The present investigation aims to develop a potential composite phase change material (PCM) with leak-resistive and high thermal conductivity. Sugar beet pulp (CSBP) as an industrial waste was carbonized to produce a porous framework and used for solving leakage issue and boosting thermal conductivity of capric-stearic acid eutectic mixture (CSEM)...

The foremost challenges in heat pipe ETC are low heat transfer rate between absorber tube & heat pipe, overheating of heat pipes, and its inability to supply hot water during off-pick hours. The incorporation of latent heat storage material (LHSM) between absorber tube and heat pipe is the efficient solution to overcome these challenges. Also, alon...

India’s annual Khoa (Heat Desiccated Milk Food) production was approximately estimated as 7.58 × 10⁶ MT in the year 2019. The khoa is consumed in huge quantities for preparing Indian sweets and; the magnitudes of steam (2365 kg/MT) and electricity (89.23kWh/MT) consumptions in this activity are quite high. In view of this, the present research is a...

Phase change materials (PCMs) utilized for thermal energy storage applications are verified to be a promising technology due to their larger benefits over other heat storage techniques. Apart from the advantageous thermophysical properties of PCM, the effective utilization of PCM depends on its life span. Moreover, PCMs which are utilized for diffe...

This book presents the select proceedings of the International Conference on Advances in Sustainable Technologies (ICAST 2020), organized by Lovely Professional University, Punjab, India. It gives an overview of recent developments in the field of fluid dynamics and thermal engineering. Some of the topics covered in this book include HVAC systems,...

A novel nano enhanced binary eutectic phase change material (PCM) of Palmitic acid (64 wt%) and stearic acid (36 wt%) as base PCM and copper oxide nanomaterial in varying mass fractions (0.3%, 0.8%, 1.5% and 3%) as thermal conductive enhancer was prepared using two step method and its heat transfer properties were investigated. Thermal characterist...

The jungle cat Felis chaus is one of the 10 small cat species found in India and most common cat which is widely distributed throughout the Indian subcontinent. Yet little is known about the ecology of this cat, although relatively better studied than other small cats in India, especially in the human dominated agricultural landscape in India. We p...

The depletion of conventional energy sources and their adverse effects on the environment have fetched the attention of global researchers on the renewable sources of energy. Solar energy is freely and abundantly available and can be effectively utilized in many domestic/industrial applications. Cooking being one of the biggest consumers of energy...

In order to avoid perishable characteristics and secure long shelf life of liquid milk, it is mostly converted into more stable derivatives such as butter, cheese, yogurt and milk powder. Amongst them, milk powder contains highest shelf life at ambient conditions and accounts for 76% of global annual trade of milk and milk derivatives. The milk pow...

In the present day, manufacturing of energy from renewable energy origins is one of our top major concerns; to address this, researchers are putting efforts to solve this energy crisis. Organic phase change materials (PCMs) are extensively used for storing thermal energy to strengthen and control this renewable energy. During the phase transition p...

The excessively available solar energy storage is a very useful way to bridge the energy demand and its supply gap. This thermal energy storage (TES) can be done in the form of sensible or latent heat energy. The energy storage in the form of latent heat energy is better than the sensible energy storage in terms of operating temperature and storage...

The current study gives out the preparation and development of novel ternary eutectic mixture comprises of polyethylene glycol (PEG) molecular weight of 2000, 6000 and 10,000. The mixture was developed in various weight fraction ratios. Differential scanning calorimetry (DSC) result suggests that the fusion latent heat and melting temperature of th...

The most efficient way to store thermal energy is the latent heat energy storage method because of its high energy storage density and almost constant freezing/melting temperature. The present study deals with the preparation and development of eutectic mixture phase change materials (PCMs). The mixture consists of polyethylene glycol (PEG) and myr...

In this paper, we produced new kind cement mortars with thermal energy storing/releasing properties, containing silica fume (SF)/capric acid-stearic acid eutectic mixture (CA-SA) as form-stable composite phase change material (FSC-PCM). The physicochemical compatibility between CA-SA eutectic PCM and SF was studied by fourier-transform infrared (FT...

To enhance the thermal mass of buildings, form-stable fly ash/lauric acid-myristic acid eutectic mixture composites (FSC) were incorporated into the standard cement mortar to produce novel cement mortars with ability of heat charging/discharging properties. The chemical, crystalline and morphological properties of the produced FSC were examined by...

Two kinds of bio-carbons were developed by carbonization/and chemical activation of walnut shell (WS) as lightweight, porous, low-cost and environmental friendly supporting matrix. The produced walnut shell carbon (WSC) and activated WSC (AWSC) were evaluated as novel shape stabilizer and thermal conductivity enhancer for methyl palmitate (MP) pref...

This paper presents the findings on preparation and thermal analysis of binary eutectic mixture of polyethylene glycol 2000 and 6000. Their measured latent heat are 165.3 J/g and 220 J/g respectively. Eutectic mixtures of these materials were prepared by weight percentage composition with an increment of 10% i.e. compositions of PEG 2000 : PEG 6000...

Two kinds of new bio-chars were produced from carbonization of waste hazelnut wood as low-cost and eco-friendly supporting matrices to simultaneously solve the seepage and low thermal conductivity problem of capric acid (CA) used as a phase change materials (PCM) for thermal management applications. In the prepared seepage-free composites, the CA w...

Heptadecane (HD) is a useful solid–liquid phase change material (PCM) because of its good thermal energy storage (TES) properties. However, leakage problems throughout the phase change and its relatively low thermal conductivity have significantly restricted its TES utility areas. Simultaneously, to prevent leakage and increase its thermal conducti...

This book presents a very useful and readable collection of chapters in nanotechnologies for energy conversion, storage, and utilization, offering new results which are sure to be of interest to researchers, students, and engineers in the field of nanotechnologies and energy. Readers will find energy systems and nanotechnology very useful in many w...

This experimental investigation presents the two major aspects of thermal energy storage materials. One is development of eutectic mixtures of polyethylene glycols (PEGs) and another is thermal reliability of them. The commercial grade PEGs with molecular mass 2000 and 10000 were mixed in different mass fractions via facile incorporation method for...

The present study focused on the preparation of form‐stable composites of 1‐tetradecanoic acid (TDA)/titanium dioxide (TiO2) powder via a facile impregnation method. The use of powdered TiO2 as porous material and thermal conductivity enhancer for TDA is a novel attempt. The morphological, chemical, and crystalline properties of form‐stable composi...

In the present investigation, a novel composite of Polyethylene glycol (PEG) with molecular weight 10,000 (10 k) and aluminum oxide nanoparticle were prepared for solar thermal energy storage system. A composite of nanoparticles of Al2O3 in different mass fraction (1%, 2%, 3%, 4%, and 5%) and PEG 10,000 was prepared. The thermal properties of these...

Integration of a building mass with a phase change-energy storage material is able to improve its thermal efficiency. With this respect, pumice was evaluated as low-cost supporting material for development of energy-efficient composites containing capric acid (CA) and polyethylene glycol(PEG) as phase change material (PCM). The developed leak-proof...

The most efficient way to store thermal energy is the latent heat energy storage method because of its high energy storage density and almost constant freezing/melting temperature. The present study deals with the preparation of eutectic Phase change material (PCM) which is the mixture of myristic acid and Polyethylene glycol (PEG) of molecular wei...

The thermal cycling stability of phase change material (PCM) is one of the key parameters for real-scale thermal energy storage (TES) applications. The fatty alcohols as PCMs possess significantly large amount of energy storage capacity with suitable low and medium melting temperature range for thermal regulation of food carriers, textiles etc. How...

A numerical study is aimed at comparing dissimilar types of repeated-rib roughness: arc-shape with gap and V-shape with gap on the absorber plate of the solar air heater having similar shape and size working under identical boundary conditions. Relative gap width (g/e) of 1, relative roughness height of 0.04, the relative roughness pitch of 10, p/P...

Thermal energy can be stored in the form of latent heat as well as in the form of sensible heat energy. Latent heat storage is preferred over the sensible heat storage because of its higher storage density and almost constant temperature for melting and solidifying processes. This paper reports a comprehensive review of previous work on various eut...

In present work, techno-economic and thermodynamic analysis of an ETC with/without PCM has been undertaken. The results approved that for all selected flow rates, ETC/S obtained higher energy and exergy efficiencies in comparison to the ETC/WS design. The maximum attained value of average daily energy efficiency for ETC/S and ETC/WS was 78.36% and...

In this experimental study, thermal aging test for investigating the variations in thermal and chemical properties of two selected organic phase change materials (PCMs) has been carried out. Polyethylene glycols (PEGs) of molecular weight of 2000 and 10 000 have been considered as potential latent heat thermal energy storage (LHTES) materials for i...

The present study deals with the determination of value of friction factor (f) using the explicit and implicit form of equation in the fluid flow mainly in the turbulent flow regime. A computer programming has been developed to determine the friction factor value of the Colebrook white equation which is in the implicit form. The aim is to reduce th...

In-depth understanding of flow and pumping characteristics of the nanofluids in a narrow fluidic channel is required for accurate control of micropumps. The present paper studies the nanofluids flow driven by the combined effects of peristaltic pumping and external electric field through microchannel. Double diffusive convection in nanofluids is ex...

Thermal energy storage (TES) properties of form-stabilized Sepiolite(Sep)/Fatty acid eutectic composite PCM(FAEM) and temperature control performance of its cement based-plaster in laboratory scale were investigated. The eutectic mixture of capric acid(CA) and stearic acid(SA) recognized as FAEM was infiltrated by Sep by direct impregnation method....

In this paper, the results of a numerical simulation of solidification phenomenon of nanoparticles mixed phase change materials are presented. The nanoparticles of copper dispersed in water were considered as nanofluid filled in a wavy cavity for this study. A parametric study concerning with the effect of nanoparticle volume fractions, initial tem...

The aim of this paper is to study the Bodewadt flow of a magnetic nanofluid in the presence of geothermal viscosity. The effects of porosity on an unsteady boundary layer flow of water-based magnetic nanofluids over a uniformly heated stationary disk are discussed numerically. Fluid viscosity is considered as a function of both depth and temperatur...

The purpose of this experimental study is to determine the thermal and chemical reliability of organic phase change materials (O-PCMs) viz. paraffin, palmitic acid, and myristic acid for 1500 accelerated melt/freeze. The differential scanning calorimeter (DSC) was used to measure the melting temperature and the latent heat of fusion at zeroth cycle...

A numerical study has been carried out to investigate the solidification of a binary mixture of water and Cu nanoparticles inside a horizontal trapezoidal cavity of different aspect ratio under specific given boundary conditions for temperature and concentration gradients. The vertical side walls of the cavity are insulated while the top wall tempe...

This paper reports the results of a numerical study on the heat transfer during process of conduction dominated solidification of copper-water nanofluid in isosceles trapezoidal cavity under controlled temperature and concentration gradients. The suspended nanoparticles have proven to increase the heat transfer rate substantially. The horizontal wa...

A numerical investigation of incompressible and transient flow around circular pipe has been carried out at different five gap phases. Flow equations such as Navier-Stokes and continuity equations have been solved using finite volume method. Unsteady horizontal velocity and kinetic energy square root profiles are plotted using different turbulence...

A numerical study has been carried out to investigate the solidification of a binary mixture of pure water and Cu nanoparticles inside a horizontal trapezoidal cavity of different dimensions under specific given boundary conditions for temperature and concentration gradients. The vertical side walls of the cavity are insulated while the top wall te...

An optimisation technique for design of gating system parameters of a cylindrical aluminium casting based on the Taguchi method is proposed in this paper. The various gating systems for a casting model of aluminium are designed. Mould filling and solidification processes of the Aluminium casting were simulated with the PROCAST, AUTOCAST, and MAGMAS...