IOSR Journal of Engineering (IOSRJEN) www.iosrjen.org ISSN (e): 2250-3021, ISSN (p): 2278-8719 Vol. 10, Issue 1, January 2020, ||Series -IV|| PP 25-28 International organization of Scientific Research 25 | Page A New Experimental set up for Verification of Newtons Law of Viscocity for different fluids. 1 Prasad A Hatwalne, 2 Dr Shashank Thakre 1 Assistant Professor, Dept Of Mechanical Engg,DBACER, Nagpur, India. 2 Professor, Dept Of Mechanical Engg, PRMIT&R, Badnera, India. Received 02January 2020; Accepted 16 January 2020 Abstract: An experimental setup has been developed for theverification of newtons law viscocity. This experiment confirms direct proportionality between shear stress and the rate of shear strain. Different fluids with known value of viscocity such as glycerien, honey, water, engine oil etc were tested for charecterization.Results shown that honey shows the non newtonian behaviour and glycerian and unburnt engine oil shows the newtonian behaviour. Fluid mechanics is the study of fluids either in motion or at rest for both liquids and gases. There is a theory available for fluid flow problems and it should be backed up by experiment. As there are the various experimental setup for verifying the different laws in fluid mechanics, but there is no setup to verify Newton’s law of viscosity. Here we propose the experimental setup for verification of Newton’s law of Viscosity. Keywords: Viscocity, shear stress, shear strain, honey, glycerien, engine oil. I. INTRODUCTION Viscosity is the physical property that characterizes the flow resistance of simple fluids (1). Newton’s law of viscosity defines the relationship between the shear stress and shear rate of a fluid subjected to a mechanical stress. The ratio of shear stress to shear rate is a constant, for a given temperature and pressure, and is defined as the viscosity or coefficient of viscosity. Newtonian fluids obey Newton’s law of viscosity. The viscosity is independent of the shear rate. Non-Newtonian fluids do not follow Newton’s law and, thus, their viscosity (ratio of shear stress to shear rate) is not constant and is dependent on the shear rate.Dynamic viscosity is the coefficient of viscosity as defined in Newton’s law of viscosity. Accurate descriptions of viscosity have a broad range of applications, from the characterization of blood flow as it relates to corollary heart disease to optimizing lubricants for mechanical systems.(2) Newton’s Law of viscosity state that “The shear stress on fluid element layer is directly proportional to the rate of shear strain” τ = μ. du dy Where, τ = Shear stress developed across layers of fluid μ= Cofficient of dynamic viscocity, du= change in velocity dy =distance between fluid layers du/dy is also called as rate of shear strain Fig1: Shear stress Vs Rate of shear Strain For introductory courses students, it is well known the Newtons’ law of viscocity . However, usually, this law is introduced in its final form without any demonstration or experimental verification. (3) The importance of the phenomena related to this law substantiates the existence of a specific experiment to study it. We propose here a simple experimental setup for verifcation of this law. By using the proposed experimental