Investigating the Impact of Chromium and Titanium in Mechanical and Corrosion Properties of Iron Alloy Coating Materials Deposited via HVOF Dr. Ratnesh Kumar Sharma, Randip Kumar Das, Shiv Ranjan Kumar, Ajay Sharma Evergreen, 2025 The present study focuses on fabrication of Fe-Cr-Ti alloy HVOF coating with varying Cr and Ti content and investigates the impact of Cr and Ti content on mechanical and corrosion properties. Mechanical performance metrics, including adhesion pull-off strength, and corrosion characteristics, were compared. 10 weight percent of chromium was found to enhance the hardness, adhesion pull off strength, and fracture toughness by 22 %, 23 %, and 17 %, respectively. On the other hand, the addition of 10 weight % titanium increased the hardness, adhesion pull off strength and fracture toughness by 59%, 7% and 50% respectively. Considering all the performance factor for the alloying element content up to 10 weight %, it is concluded that titanium appears to be more important than chromium in terms of mechanical properties and Cr appears to be more important in term of corrosion.
CFD Based Performance Evaluation of Solar Air Heater by using Centerline Perforated Sine Wave Baffles Evergreen, 2024
Investigating the impact of n-heptane (C7H16) and nanoparticles (TiO2) on diesel–microalgae biodiesel blend in CI diesel engines Nikunj Upadhyay, Randip Kumar Das, Subrata Kumar Ghosh Environmental Science and Pollution Research, 2024 Recent global challenges encompass profound environmental pollution and the depletion of finite fuel resources. In this study, the biodiesel used in the mixture was derived from Azolla pinnata microalgae oil through a trans-esterification reaction chosen for its high oil concentration. During the initial phase of the experiment, varying volumes of biodiesel (5%, 10%, and 15%) and n-heptane (5%, 10%, and 15%) were introduced to diesel to form a ternary fuel blend. The experimental outcome shows that an n-heptane and biodiesel mixture of 10% by volume would produce the best results. Next, experiments were carried out by incorporating 10, 40, and 80 ppm titanium oxide (TiO<sub>2</sub>) nanoparticles (NPs) in a recommended ternary fuel blend. The experimental investigation showed that D80A10H10TNP40 (diesel 80% + biodiesel 10% + n-heptane 10% + TiO<sub>2</sub> 40 ppm) caused a 7.21% increase in brake thermal efficiency (BTE) with a decrease in brake specific fuel consumption (BSFC) and brake specific energy consumption (BSEC) by 9.58% and 10%, respectively, compared to (diesel 80% + biodiesel 20%) D80A20. D80A10H10TNP40 exhibits lower emissions, with a significant reduction of 11.29% and 20.96% in carbon monoxide (CO) and unburnt hydrocarbons (UBHC), respectively. Nitrogen oxide (NO<sub>X</sub>) and smoke emissions were reduced by 3.3% and 11.13%, respectively, compared to D80A10H10. Furthermore, D80A10H10TNP40 demonstrated enhanced combustion properties, comprising a significant rise of 4.39% in-cylinder pressure (CP), 35.29% in heat release rate (HRR), and 25.05% in the rate of pressure rise (RPR). The findings of this investigation indicate that D80A10H10TNP40 exhibits enhanced efficiency, emission, and combustion properties compared to the D80A20 fuel.
Parametric optimization of solar air heater having sine wave baffles as turbulators Sachin Sharma, Randip Kumar Das, Kishor Kulkarni Experimental Heat Transfer, 2024 The performance of a solar air heater roughened with sine wave baffles has been calculated in terms of effective and thermal efficiency. Relative baffle length (Lb/LP), relative roughness pitch Pst/e, relative height e/H, angle of attack (α∘), Reynolds number Re, Insolation I and Temperature rise parameter ΔT/I are the operational parameters. The sine wave roughened solar air heater has a higher effective and thermal efficiency than the smooth air heater. The thermal efficiency has boosted to 78%, and the effective efficiency has been improved to 70.8%. A parametric analysis has been carried out to determine the best set of parameters.
Direct injection diesel engine characteristics fuelled with diesel, biodiesel and 1-butanol blends Siraj Sayyed, Kishor Kulkarni, Randip Kumar Das, Tabish Alam, Sayed M. Eldin Case Studies in Thermal Engineering, 2024 The current study concentrated on performance, combustion and emission characteristics of a direct injection diesel engine. The experiments were carried out on single cylinder Kirloskar make TV-1 diesel engine test-rig. The blends were made using equal parts of Karanja biodiesel (Pongamia pinnata) and 1-butanol with plain diesel. For the experiment, five mixes were investigated at constant speed of 1500 rpm and varying loading condition from no load to full load in 25 % steps. The properties of the mixtures considered are within the permissible ASTM limits. The study revealed that performance characteristics such as brake thermal efficiency, mechanical efficiency are observed highest for D80K10B10 blend at 100 % BP and BSEC at 25 % BP for D80K20 blend. No appreciable variations are observed in volumetric efficiencies and concentration of 1-Butanol showed greater reduction in EGT amongst others. Highest CO emission reduction to 53 % whereas 31 % CO2 increases and HC, and NOx emissions are observed marginally increased. Long term test and energy-exergy analysis should be required to get more in insights from the research.
Thermodynamic investigation of diffusion absorption refrigeration technology with triple fluid International Journal of Applied Engineering Research, 2015
