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Raigad, India

Dr. Babasaheb Ambedkar Technological University is a unitary, state university located at Lonere in Raigad district, Maharashtra, India. Established by Government of Maharashtra in 1989 under the Government of Maharashtra Act 1983. The University is set to become the center of all the engineering and technological Institutes in Maharashtra. Wikipedia.

Agrawal N.,Dr. Babasaheb Ambedkar Technological University | Bhattacharyya S.,Indian Institute of Technology Kharagpur
International Journal of Refrigeration | Year: 2011

Experimental studies for a prototype CO2 heat pump system employing capillary tube as an expansion device for simultaneous water heating and cooling have been presented. Tests were conducted with two stainless steel capillary tubes having specifications of ID = 1.71 mm, L = 2.95 m, εc = 3.92 μm and ID = 1.42 mm, L = 1.0 m, εc = 5.76 μm. System performance is significantly influenced by gas cooler water inlet temperature, whereas the effect of water flow rate on system performance is modest. An optimum charge is also recorded at which the system yields the best COP with a capillary tube. Performance deterioration is more severe at undercharged condition than at overcharged condition. Comparisons of test data with simulated results show that maximum deviation in mass flow rate of refrigerant is about ±10% and the flow characteristics exhibit a reasonably good match with the test data. © 2010 Elsevier Ltd and IIR. All rights reserved.

Deosarkar M.P.,Institute of Chemical Technology | Sathe V.S.,Dr. Babasaheb Ambedkar Technological University
Powder Technology | Year: 2012

In this paper, we study the theoretical models for effect of various parameters used for predicting viscosity of magnetite ore slurry. These models are fitted using data collected from experiments conducted. These viscous slurries of magnetite ore have up to 30% solids (by weight). We prepared the slurry samples of magnetite in aqueous solutions of high viscosity powder of sodium salt of carboxy methyl cellulose (CMC) and guar gum. Average particle sizes of the four solid samples used were of 50, 52.3, 58.4 and 74.8 μm. The viscosity of slurry samples was measured using Brookfield DV-III + programmable rheometer. Once the experimental data was collected, we selected six different models for predicting viscosity; also we used artificial neural networks (ANN) for fitting the experimental data, and, trained the neural networks to predict viscosity for unknown samples. We have finally computed the root mean square errors (RMSE) between model predictions and corresponding measured value of viscosity. The conclusions drawn and certain observations made are reported. © 2011 Elsevier B.V.

Patil N.G.,Dr. Babasaheb Ambedkar Technological University | Brahmankar P.K.,Dr. Babasaheb Ambedkar Technological University
International Journal of Advanced Manufacturing Technology | Year: 2010

Non-traditional process like wire electro-discharge machining is found to show a promise for machining metal matrix composites. However, the machining information for the difficult-to-machine particle-reinforced material is inadequate. This paper is focused on experimental investigation to examine the effect of electrical as well as non-electrical machining parameters on performance in wire electro-discharge machining of metal matrix composites (Al/Al2O3p). Taguchi orthogonal array was used to study the effect of combination of reinforcement, current, pulse on-time, off-time, servo reference voltage, maximum feed speed, wire speed, flushing pressure and wire tension on cutting speed, surface finish, and kerf width. Reinforcement percentage, current, and on-time was found to have significant effect on cutting rate, surface finish, and kerf width. The optimum machining parameter combinations were obtained for surface finish, cutting speed, and kerf width separately. Wire breakages were found to pose limitations on the cutting speed in machining of these materials. Wire shifting was found to deteriorate the machined surfaces. © 2009 Springer-Verlag London Limited.

Sarkar J.,H+ Technology | Agrawal N.,Dr. Babasaheb Ambedkar Technological University
International Journal of Thermal Sciences | Year: 2010

Being a low critical temperature fluid, CO2 transcritical system offers low COP for a given application. Parallel compression economization is one of the techniques to improve the COP for transcritical CO2 cycle. An optimization study of transcritical CO2 refrigeration cycle with parallel compression economization is presented in this paper. Further, performance comparisons of three different COP improvement techniques; parallel compression economization alone, parallel compression economization with recooler and multistage compression with flash gas bypass are also presented for chosen operating conditions. Results show that the parallel compression economization is more effective at lower evaporator temperature. The expression for optimum discharge pressure has been developed which offers useful guideline for optimal system design and operation. Study shows that the parallel compression with economizer is promising transcritical CO2 cycle modifications over other studied cycle configurations. A maximum improvement of 47.3% in optimum COP is observed by employing parallel compression economization for the studied ranges. © 2009 Elsevier Masson SAS.

Mane V.S.,Dr. Babasaheb Ambedkar Technological University | Vijay Babu P.V.,Dr. Babasaheb Ambedkar Technological University
Journal of the Taiwan Institute of Chemical Engineers | Year: 2013

Eucalyptus wood (Eucalyptus globulus) saw dust (SD) was treated using sodium hydroxide to improve adsorption capacity for the removal of Congo red from aqueous solutions. The treated saw dusts using sodium hydroxide was evaluated through SEM, FTIR, TGA and XRD. The Brunauer-Emmett-Teller (BET) surface area, pore volume and average pore diameter of SD were 0.3742m2/g, 0.00836cm3/g and 893.6Å. Average particle size of SD was 182.8μm. Bulk density of SD was 212kg/m3. The porosity of SD is 0.3. Equilibrium and kinetic adsorption studies were carried using SD. The effect of various operating parameters like initial pH, contact time, adsorbent dose, initial concentration and temperature on the removal of Congo red has been studied. The Congo red adsorption data were fitted to various isotherm models. It was found that Redlich and Peterson (R-P) model fitted well. The optimum pH for the adsorption was 7. The kinetics of adsorption showed that the Congo red adsorption on SD is a gradual process with quasi-equilibrium being attained in 4h. The data obtained were also applied to pseudo first-order, pseudo second-order and Weber-Morris equations. The rates of adsorption were found to conform to pseudo second-order kinetics. The adsorption of the Congo red increased with increasing temperature indicating the endothermic nature of the adsorption process. Thermodynamic parameters such as free energy, enthalpy and entropy change were calculated. This adsorbent was found to be both effective and economically viable. © 2012 Taiwan Institute of Chemical Engineers.

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