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Papers by NEETA AMOL MANDHARE 16PHD1109

Journal of Pressure Vessel Technology-transactions of The Asme, Jul 17, 2019

Centrifugal pumps are one of the significant consumers of electricity and are one of the most com... more Centrifugal pumps are one of the significant consumers of electricity and are one of the most commonly encountered rotodynamic machines in domestic and industrial applications. Centrifugal pumps operating at off-design conditions are often subject to different periodic flow randomness, which in turn hampers functionality and performance of the pump. These limitations can be overcome by modification in the conventional design of different components of a centrifugal pump, which can assuage flow randomness and instabilities, reconstitute flow pattern and minimize hydraulic flow losses. In this article, flow vulnerabilities like pressure and flow inconsistency, recirculation, boundary layer separation, adverse rotor–stator interaction, and the effects on operation and performance of a centrifugal pump are reviewed. This article also aims to review design modification attempts made by different researchers such as impeller trimming, rounding, geometry modification of different components, providing microgrooves on the impeller and others. Based on the findings of this study, it is concluded that some design modifications of the impeller, diffuser, and casing result in improvement of functionality, efficiency, and reduction in pressure fluctuations, flow recirculation, and vibrations. Design modifications should improve the performance without hampering functionality and useful operational range of the pump. Considerable research is still necessary to continue understanding and correlating flow physics and design modifications for the pump impeller, diffuser, and casing.

Journal of Energy Storage

SN Applied Sciences, 2020

Present study focuses on the experimental and numerical investigation of the effect of surface ro... more Present study focuses on the experimental and numerical investigation of the effect of surface roughness of casing and adhesive coating on the efficiency of centrifugal pump. It consists of two parts; in the first part, effect of coating centrifugal pump casing by ultra-smooth ceramic based coating on the efficiency of the centrifugal pump is investigated experimentally. In the second part, effect of change in surface roughness of casing is investigated numerically by using the CFD tool. The surface roughness of casing is modeled in terms of effective sand grain size parameters and investigated by solving Reynolds-averaged Navier-Stokes equation at volume mesh. Effects of three surface roughnesses, i.e., 100 μm, 200 μm and 300 μm, are investigated numerically. It is observed that surface roughness of casing has considerable effect on pump performance, and pump head decreases by 9.06-14.73% by change in surface roughness from 100 to 300 μm for different mass flow rates values. For same flow rate, centrifugal pump with coated casing produces more head than that of pump without coating. Coating casing with the ultra-smooth adhesive material results in maximum efficiency enhancement of 9.6%.

Materials Today: Proceedings, 2021

Thin-plate weirs are the simplest and least expensive devices, which frequently have been employe... more Thin-plate weirs are the simplest and least expensive devices, which frequently have been employed in many water projects. In this research, a unique type of Sharp-Crested V-notch weir, entitled SCVW, has been introduced. The hydraulic characteristics of the present weir were investigated theoretically and experimentally under free aerated flow conditions in an open channel for large physical models. To investigate the variations of the discharge coefficient of SCVW versus weir height and vertex angle, a comprehensive laboratory experiments were conducted by measuring the discharge and the water head over the crest of

Journal of Pressure Vessel Technology

Flow turbulence near the suction region and over the eye of a closed impeller may be troublesome ... more Flow turbulence near the suction region and over the eye of a closed impeller may be troublesome during the operation of a centrifugal pump. This paper aims to bring out a methodology for minimization of flow turbulence and for providing guidance to suction flow by modifying the surface design of the lock nut into a nose cap of optimized profile. The effects of this modification on the performance parameters of closed impeller of a low head, mixed flow centrifugal pump are presented here. Based on geometric constraints and impeller eye diameter, nose caps of 65 mm diameter and various nose tip angles (15- 90o ) and lengths (50 -80 mm) are designed. Parametric studies are carried out via Computational Fluid Dynamics (CFD) analyses using ANSYS FLUENT 17.0 as well as experimental investigations to investigate the effects on head, energy consumption and overall efficiency for flow rates in the range of 0.25-1.5 times the flow rate at Best Efficiency Point (BEP). The estimates of head de...