Randip Kumar Das

@iitism.ac.in

Prefessor, Mechanical Engg. Department
Indian Institute of Technology (ISM)) Dhanbad



              

https://researchid.co/ranadipdas

RESEARCH INTERESTS

Thermodynamics, energy, refrigeration Heat Transfer

58

Scopus Publications

Scopus Publications

  • CFD Based Performance Evaluation of Solar Air Heater by using Centerline Perforated Sine Wave Baffles


  • Size impact of cerium oxide nanoparticles (CeO<inf>2</inf>) on ternary fuel blend using third-generation biodiesel in VCR diesel engine
    Nikunj Upadhyay, Randip Kumar Das, and Subrata Kumar Ghosh
    Springer Science and Business Media LLC


  • Study of vapor compression refrigeration system with suspended nanoparticles in the low GWP refrigerant
    Uma Shankar Prasad, Radhey Shyam Mishra, and Ranadip Kumar Das
    Springer Science and Business Media LLC

  • Direct injection diesel engine characteristics fuelled with diesel, biodiesel and 1-butanol blends
    Siraj Sayyed, Kishor Kulkarni, Randip Kumar Das, Tabish Alam, and Sayed M. Eldin
    Elsevier BV

  • Parametric optimization of solar air heater having sine wave baffles as turbulators
    Sachin Sharma, Randip Kumar Das, and Kishor Kulkarni
    Informa UK Limited

  • Comparative investigation on mechanical properties of iron alloy based coating material: A comprehensive review
    R. K. Sharma, R. K. Das, and S. R. Kumar
    Wiley
    AbstractThe primary focus of this paper is to review the latest developments in iron based amorphous/nanocrystalline high velocity oxy fuel coatings. The extensive development towards the enhancement in the mechanical properties such as micro‐hardness, compressive strength, adhesion strength etc. and comparative investigations are the key objectives set by the coating material scientist. The industrial application fields of iron alloy based coating are growing rapidly and owing to the rapid increase in industrial applications, there are many more advancements in the coating deposition techniques. In the present review, various factors influencing mechanical performance of high velocity oxy fuel coating material have been listed and ranked according to the level of influence. It can be concluded that the mechanical performance of coating materials is significantly influenced by coating parameters, including spray distance, oxygen fuel ratio, coating thickness, and number of layers.


  • Influence of additive mixed ethanol-biodiesel blends on diesel engine characteristics
    Siraj Sayyed, Randip Kumar Das, Kishor Kulkarni, Tabish Alam, and Sayed M. Eldin
    Elsevier BV

  • Designing of low cost solar air heater equipped with roughness of streamlined cross-section
    Sanjeev Kumar, Randip Kumar Das, Kishor Kulkarni, Tabish Alam, and Sayed M. Eldin
    Elsevier BV

  • Energy and Exergy Analyses of Multiple Biodiesel Blended Diesel Engine
    Siraj Sayyed, Randip Kumar Das, and Kishor Kulkarni
    ASME International
    Abstract This paper deals with the experimental investigation of direct injection compression ignition (DICI) engine runs with multiple biodiesels–diesel blended and neat diesel fuels along with the energy-exergy analysis to evaluate quantitative and qualitative data for determining energy and exergy efficiencies, losses, and exergy destruction. Second-generation biodiesels are utilized to conduct experiments on engine with constant speed and full throttle condition at a compression ratio of 17.5:1. Energy analysis is based on experimental data, and exergy analysis is performed with the help of derived formula using chemical and molecular structures. Variation in the performance, combustion, and emission parameters for B0, B10, and B20 blends reveals that BTE, AFR, η(mech.), η(vol.), CP, and CO decrease with the increase in BSEC, EGT, MGT, RPR, NHR, CO2, HC, and NOx. Energy-exergy analysis shows that the combustion and exergetic efficiencies are maximum for the B20 blend (+87.73%) and (+52.04%) at 2.5 kW and 3.3 kW BPs. Exergy destructed is observed to be three-fifth of total available exergy. Half of the heat supplied is carried away by cooling water while one-third of heat is converted into brake power, and the remaining heat is lost in exhaust gases and unaccounted losses.

  • Experimental and Simulation Study of the Latest HFC/HFO and Blend of Refrigerants in Vapour Compression Refrigeration System as an Alternative of R134a
    Uma Shankar Prasad, Radhey Shyam Mishra, Ranadip Kumar Das, and Hargovind Soni
    MDPI AG
    Experimental and simulation investigation of the performance and characteristics of different refrigerants and blends of refrigerants is carried out to replace the existing refrigerant R134a for a vapour compression refrigeration system. The performance of VCRS systems was improved by several researchers by introducing the concept of mixing the family of refrigerants with low GWP in the working circuit. This research paper presents the performance results of different refrigerants and blends of refrigerants that can replace the R134a it is also an attempt to cover the mechanism and possible combination of different blends of refrigerants to improve the effectiveness as well as efficiency of the refrigeration system. Detailed analysis of different parameters of heat transfer and predictions of low-GWP refrigerants, including the HFO (hydro fluoro-olefin) class and the HC (hydrocarbon) class through energy and exergy analysis of commercial refrigerants such as R134a is performed. Results are obtained by using an experimental test rig and the input parameters of the experiments are kept the same with the simulation software (CYCLE_D-HX 2.0) and validated with the results to replace R134a.

  • HVOF Deposition, comparative investigation and optimum selection of molybdenum, boron, chromium, and titanium in Iron amorphous composite coatings
    Ratnesh Kumar Sharma, Randip Kumar Das, and Shiv Ranjan Kumar
    Informa UK Limited
    ABSTRACT The current investigation focuses on the comparative assessment of each alloying element such as titanium, chromium, boron, and molybdenum on mechanical and solid particle erosion behaviour of Iron amorphous composite coatings. Iron amorphous composite coatings were deposited on 316L steel. Based on mechanical and erosion properties, the ranking of the alloying element was derived using the Fuzzy analytic hierarchy process (FAHP) and Grey relational analysis (GRA). Eight different series of Iron-based composite coatings with varying alloying elements were deposited on 316L steel. The results indicated that titanium showed the maximum hardness and adhesion pull-off strength, boron showed maximum fracture toughness, Molybdenum indicated the lowest porosity and chromium indicated maximum corrosion resistance. The result of FAHP + GRA concluded that the ranking of Fe amorphous composite coatings followed the order as FeCSiMoBCr10Ti (C-2)> FeCSiMoBCr5Ti (C-1) FeCSiMo10BCrTi (C-6)> > FeCSiMo5BCrTi (C-5)> FeCSi10MoBCrTi (C-8) > FeCSiMoB10CrTi (C-4) > FeCSi5MoBCrTi (C-7) > FeCSiMoB5CrTi (C-3).

  • Investigation of solid particle erosion behaviour of Fe-Cr alloy coating
    Randip Das, Ratnesh Sharma, and Shiv Kumar
    Inderscience Publishers

  • Microstructure, mechanical and tribological properties of high velocity oxy fuel thermal spray coating: A review
    R. K. Sharma, R. K. Das, and S. R. Kumar
    Wiley
    Iron alloy based amorphous coating materials have enormous potential in wide range of applications such as petrochemical, aerospace, ocean, and electronic communications due to their better mechanical properties, chemical properties, magnetic properties and tribological properties. The industrial applications of coating are increasing rapidly due to many advancements in the material development and coating deposition techniques. The present paper reviewed the recent progresses in deposition technologies, development of new high order alloys and composite based coating materials. In this regard, change in microstructure, elemental composition, mechanical and tribological properties on performance of iron alloy based coating properties were presented. It can be concluded that the tribological properties of coating is dependent on pre‐coating and post‐coating factors. Pre‐coating factors include coating deposition techniques, coating layer thickness and coating parameters such as spray distance, oxygen flow rate etc. Post‐coating factors include microstructure, hardness, fracture toughness and adhesion strength. Therefore, multi‐criteria decision making techniques can be the best approach to find the optimum formulation of coating materials to achieve desired set of objectives under the conflicting criteria.

  • Experimental analysis and thermal management of solar air heater roughened with sine wave baffles
    Sachin Sharma, Randip K Das, and Kishor Kulkarni
    SAGE Publications
    In the present study, a thermo-hydraulic performance (THP) of solar air heater (SAH) has been assessed by placing sine wave-shaped baffles on the heat-absorbing surface. The experiments have been performed by varying Reynolds number ([Formula: see text]) ranging from 3000-18,000, relative pitch ([Formula: see text]) ranging from 8 to 14, relative height ([Formula: see text]) ranging from 0.4 to 0.55, relative baffle length [Formula: see text] ranging from 0.054 to 0.081 and angle of attack(α) ranging from 10° to 45° while the duct aspect ratio has been kept fixed at 12. The best set of geometric parameters has been decided based on Nusselt number [Formula: see text] and friction factor [Formula: see text] characteristics of the roughened SAH and compared with the smooth surface SAH, under analogous experimentation conditions. The cost analysis has also been performed and results revels that roughened SAH is more cost-effective than smooth SAH. The correlation for Nusselt number [Formula: see text], friction factor [Formula: see text], and thermo-hydraulic performance parameters (η) have been developed using regression analysis and found an average deviation of ±9.15%, ±7%, and ±9.2% respectively, from experimental results.

  • Effect of varying chromium and titanium content on corrosion, mechanical and solid particle erosion properties of iron alloy based coating
    R.K. Sharma, R.K. Das, and S.R. Kumar
    Wiley
    In the present study, three different series of iron alloy based coating materials with varying chromium and titanium content (FeMoCSiBCr10, FeMoCSiBCr10Ti10, FeMoCSiBTi10) were deposited on 316L stainless steel using High velocity oxy‐fuel spraying method. The effect of alloying element chromium and titanium on corrosion, mechanical and erosion properties of iron alloy based coating material was evaluated. Corrosion test was performed in the medium of sodium chloride (3.5 wt.%). Mechanical tests were performed in terms of micro‐hardness and fracture toughness. The solid particle erosion test of iron based coating materials was performed according to steady state condition by varying impact speed and impingement angle. The finding of results indicated that in case of 10 wt.% titanium, the micro‐hardness and fracture toughness was increased by 25.6 % and 16 % respectively, whereas in case of 10 wt.% chromium, the micro‐hardness and fracture toughness was increased by 20.6 % and 9.8 % respectively. It can be concluded for the selection of an alloying element in an iron alloy based coating material, titanium should be given preference over chromium to get better mechanical and solid particle erosion properties whereas chromium should be given preference over titanium to get better corrosion properties.


  • Effect of chromium–titanium on corrosion and erosion of HVOF coating
    Ratnesh Kumar Sharma, Randip Kumar Das, and Shiv Ranjan Kumar
    Informa UK Limited
    ABSTRACT The high-velocity oxyfuel spraying (HVOF) method was used to coat Fe–Cr–Ti-based coating material Fe60Mo5C15Si10Cr0Ti10, Fe50Mo5C15Si10Cr10Ti10, Fe50Mo5C15Si10Cr10Ti0 on base material 316L stainless steel. A comparative analysis was performed to investigate the effect of alloying element chromium and titanium on corrosion and erosion properties of Fe–Cr–Ti coating material. NaCl solution (3.5 wt.) was used for the study of corrosion behaviour. The steady-state erosion wear was examined by varying parameters such as impact speed and impact angle. It was found that the micro-hardness and fracture toughness of Fe–Cr–Ti coating material with 10 wt-% titanium were 18.02 and 5.08% more than those of the coating material with 10 wt-% chromium, respectively. This showed that titanium played a more significant role than chromium in terms of mechanical and erosion properties and a less significant role in terms of corrosion behaviour. Fe50Mo5C15Si10Cr10Ti10 indicated the least wear and a smooth surface with very few pores and wear scars.


  • Performance assessment of multiple biodiesel blended diesel engine and NOx modeling using ANN
    Siraj Sayyed, Randip Kumar Das, and Kishor Kulkarni
    Elsevier BV

  • Microstructure, mechanical and erosion wear analysis of post heat treated iron alloy based coating with varying chromium
    R. K. Sharma, R. K. Das, and S. R. Kumar
    Wiley
    The present work focuses on the effect of annealing heat treatment on the microstructure, mechanical and erosion properties of iron alloy based coatings with varying chromium content. High velocity oxygen fuel coating method was used to deposit the coating over the substrate material 316 L stainless steel. The study was done in terms of microstructural analysis using x‐ray diffractometer, surface and cross‐sectional morphology using field emission scanning electron microscope, mechanical and erosion wear analysis. It was found that x‐ray diffractometer indicated presence of less amount of titanium dioxide (TiO2) and silicon dioxide (SiO2) after heat treatment. However, the peaks of hardened phase of diironylidenetitanium (Fe2Ti) and iron‐chromium (Fe−Cr) was increased. Addition of chromium up to 10 wt. % improved the hardness and adhesion pull of strength by 16 % and 62 % respectively. On the other side heat treatment of iron alloy based coating having 10 wt. % chromium increased the hardness and adhesion pull off strength by 17.3 % and 35 % respectively. The erosion wear rate was also decreased with the annealing process. The study shows that the annealing process increases hardness and adhesion pull off strength but decreases porosity and erosion wear rate.

  • Progressive development and challenges faced by solar rotary desiccant-based air-conditioning systems: A review
    Ranjan Pratap Singh and Ranadip K. Das
    MDPI AG
    A rotary desiccant-based air-conditioning system is a heat-driven hybrid system which combines different technologies such as desiccant dehumidification, evaporative cooling, refrigeration, and regeneration. This system has an opportunity to utilize low-grade thermal energy obtained from the sun or other sources. In this paper, the basic principles and recent research developments related to rotary desiccant-based cooling systems are recalled and their applications and importance are summarized. It is shown that with novel system configurations and new desiccant materials, there is great potential for improving the performance and consistency of rotary desiccant systems; at the same time, the use of solar energy for regeneration purposes can minimize the operating cost to a great extent. Some examples are presented to demonstrate how rotary desiccant air conditioning can be a promising solution for replacing traditional vapor-compression air-conditioning systems. Recent advances and ongoing research related to solar-powered hybrid rotary desiccant cooling systems are also summarized. The hybrid systems make use of a vapor-compression system in order to have better operational flexibility. These systems, although they consume electrical energy, use solar energy as the principal source of energy, and hence, significant savings of premium energy can be obtained compared to conventional vapor-compression systems. However, further research and development are required in order to realize the sustainable operation of solar rotary desiccant air-conditioning systems, as solar energy is not steady. Reductions in capital cost and size, along with improvements in efficiency and reliability of the system is still needed for it to become a player in the market of air conditioning.


  • Effect of HVOF spraying parameters on fracture, erosion and thermal properties of Fe alloy-based coating materials
    Ratnesh Kumar Sharma, Randip Kumar Das, and Shiv Ranjan Kumar
    SAGE Publications
    Fe-based coating (Fe50Mo5C15Si10Cr10Ti10) was deposited on 316L stainless steel substrate by high-velocity oxy-fuel spraying coating process. High-velocity oxy-fuel spraying process parameters such as oxygen flow rate and spray distance were varied to investigate their effect on mechanical, wear and thermal properties. The prepared coatings were characterized in terms of mechanical properties such as micro-hardness and fracture toughness, thermal properties and erosion wear properties. X-ray diffraction analysis showed presence of hardened phase Fe2Ti and Fe-Cr. Results of this study indicated that increase in oxygen flow rate from 200 to 250 slpm improved the fracture toughness and micro-hardness by 33% and 6.7%, respectively. On the other hand, increase in spray distance decreased the fracture toughness and micro-hardness by 27.2% and 6.7%, respectively. The wear rate was increased with the increase in oxygen flow rate and decreased with the increase in spray distance. The erosion wear rate was more dependent on fracture toughness as compared to micro-hardness.