Papers by Dr Yogini Vashi
Abstract. This study intents to scrutinize the impact of ferrofluid in the presence of couple str... more Abstract. This study intents to scrutinize the impact of ferrofluid in the presence of couple stress for longitudinally rough porous circular stepped plates. The influence of longitudinal surface roughness is developed using the stochastic model of Christensen and Tonder for nonzero mean, variance and skewness. Neuringer-Roseinweig model is adopted for the influence of ferrofluid. The couple stress effect is characterized by Stoke’s micro continuum theory. The modified Reynolds’ type equation is stochastically averaged and solved by no-slip boundary conditions. The closed form solutions for load bearing capacity and film pressure are obtained as a function of different parameters and plotted graphically. It is perceived that the load capacity gets elevated owing to the combined influence of magnetization and couple stress when the proper choice of roughness parameters (negatively skewed, standard deviation) is in place. Porosity and roughness (positively skewed) adversely affect bea...
Efforts have been made to analyze the combined effect of surface roughness and slip velocity on t... more Efforts have been made to analyze the combined effect of surface roughness and slip velocity on the ferrofluid squeeze film in double layered porous circular plates. The magnetic fluid flow is governed by Neuringer – Roseinweig model while the stochastic modelling of Christensen and Tonder has been adopted to evaluate the effect of transverse roughness. The associated stochastically averaged Reynolds' type equation is solved to obtain the pressure distribution leading to the calculation of load carrying capacity. The results presented in the graphical forms establish that the magnetization offers a limited scope in containing the adverse effect of roughness, porosity, and slip velocity. However, the situation improves when negatively skewed roughness occurs. But for any type of improvement in the bearing performance the slip has to be kept at reduced level even if variance (-ve) is involved.
This article goals to determine the enactment of double layered porous rough conical plates with ... more This article goals to determine the enactment of double layered porous rough conical plates with ferrofluid based squeeze film lubrication. The Neuringer–Roseinweig model has been employed for magnetic fluid flow. For the characterization of roughness two different forms of polynomial distribution function have been used and comparison is made between both roughness structure. The stochastic model of Christensen and Tonder regarding transverse roughness has been invoked to develop the associated Reynolds’ equation from which the pressure circulation is found. This provides growth to the calculation of load-bearing capacity. From the graphical appearance it is established that from the design point of view roughness pattern G1 is more suitable compared to G2. The results presented here confirm that the introduction of double layered plates results in improved load carrying capacity. This is further enhanced by the ferrofluid lubrication. Further, the roughness affects the bearing sys...
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Papers by Dr Yogini Vashi