The order of viscosity from lowest to highest is water, sunflower oil, milk, shampoo and honey while the hypothesized order is water, milk, sunflower oil, shampoo and honey. Scientifically, viscosity is a liquid or gas tendency to resist by internal friction, the relative motion of its molecules and hence any change of shape, the magnitude of this, as measured by the force per unit, area resisting a flow in which parallel layers unit distance apart have unit speed relative to one another, also called absolute or. Viscosity the distance at which the sphere was dropped from, could have affected the terminal velocity. The objective of this experiment is to demonstrate the principles of poiseuilles law and stokes law, to directly measure the viscosity and density of selected.
As you decrease temperature, you increase a fluids viscosity. The concept of viscosity fluid flow plays a very important part in the processing of materials. Abstract this report is intended to explain an experiment performed to determine the viscosity of butcher oil as a function of temperature and to determine weather the oil was a newtonian or nonnewtonian fluid. Do not remove the densitometer from the cylinder with a particular liquid. In this book, we will see many examples of processes where the rates of heat transfer, mass transfer and chemical reaction between. Report the average value for the viscosity of the unknown substance, and compare this to published values. Friction at the molecular level viscosity is, essentially, fluid friction. Summary of completed lab generally a sentence describing each section of the lab including results. The accuracy of measurements of viscosity of liquids. Stokes law, reynolds number, and measuring liquid viscosity. Dynamic viscosity, also absolute viscosity, the more usual one typical units pas, poise, p. Determination of viscosity of organic solvents theory. The dimensions of viscosity are force per unit area divided by velocity gradient as in eq.
By doing a reverse engineering calculation using the equation given in the lab sheet for castro oil 0. Stokes law and viscosity measurement laboratory investigation no. Effects of temperaturedependent viscosity on fluid flow and heat transfer in a helical rectangular duct with a finite pitch 789 brazilian journal of chemical engineering vol. This can be written f a dv dx 1 where f is the internal friction of viscosity between layers of area a and is known as the coe cient of viscosity of the liquid and has units n. Handbooks commonly quote viscosity in centipoise 1 cp 0. Viscosity describes a fluids internal resistance to flow and may be thought of as. These ways included using a measuring beaker, eureka can, and density bottle. A single polymer molecule may consist of hundreds to a million monomers and may have a linear, branched, or network structure. Viscosity is a tensorial quantity that can be decomposed in different ways into two independent components. The reciprocal of the viscosity is called the fluidity, a measure of the ease of flow.
Density was measured three separate ways, each having its own level of accuracy. Viscometer bath manual viscometer bath for accurate temperature controls required for general laboratory use or as a constant temperature bath. In everyday terms and for fluids only, viscosity is thickness. The common practice is to calibrate viscometers by a stepup technique, using a series of instruments and test fluids, based on the viscosity of water. View lab report viscosity lab report from ce 320 at new jersey institute of technology. We used a rotating disc spindle viscometer to measure the viscosity.
Viscosity viscosity is a property of liquids that is closely related to the resistance to flow. Always wear lab coat and gloves when you are in the lab. Equation 1 is known as newtons law of viscous flow2. Full report viscousity of viscous fluids viscosity sphere. Drop one marble at a time and observe what happens to the. Determination of viscosity using ostwald viscometer with. The repeating units in the polymer molecules are held. Viscosity of liquids lap report 1815 words 8 pages experiment 1. Lab report operation unit experiment 1a measuring specific gravity of a liquid by using measuring beaker, eureka can, density bottle and hydrometer method full report kinematic viscosity viscosity report. For fluids, it basically refers to how thick a fluid is.
Full report viscousity of viscous fluids free download as word doc. Thus, water is thin, having a lower viscosity, while honey is thick, having a higher viscosity. Viscosity measurement includes three virtual experiments. Measurement of kinematic viscosity purpose to measure the kinematic viscosity of a fluid, the uncertainty of the measurement, to compare the measured kinematic viscosity to the manufacturers value, and to demonstrate the effects of viscosity by comparison of the fall times for spheres of different densities. Lab 1 viscosity lab report thermodynamics and fluids studocu. Viscosity 5 viscosity coefficients viscosity coefficients can be defined in two ways. Viscosity is a thermodynamic variable varying as a function of pressure and temperature. It is defined in terms of the force required to move one plane surface continuously past another under specified steadystate conditions when the space between is filled by the liquid in question. In this lab, you will be placing objects of known density into glycerin. Report pertinent information to responding emergency personnel. Conclusionthe hypothesis did not support the results as the hypothesized order of viscosity for the liquids are different than the results.
Chem355 experiment 6 viscosity of high polymer solutions. Determination of the kinematic viscosity by the liquid rise in. The viscosity test was performed in two different conditions in which one we kept the temperature constant and. When you enter the lab, switch on the exhaust fan and make sure that all the chemicals and reagents required for the experiment are available. Chem355 experiment 6 viscosity of high polymer solutions a polymer is a large molecule macromolecule composed of many simple units that are called repeating units. Heat is energy of random motion at the molecular level, so to have any understanding of how this energy. Like friction between moving solids, viscosity transforms kinetic energy of macroscopic motion into heat energy. Viscosity and its determination linkedin slideshare. All liquids appear resistance to flow change from liquid to another, the water faster. Experiment 1 looks at two fluid properties, density and viscosity.
It can be expressed as mass density, relative density, specific weight or specific volume. Plot the data for the calibration run and report the value of c. The goal of this experiment was to determine the viscosity of given liquids. Measurement of the viscosity of a fluid using a sphere viscometer. Viscosity 1viscosity is the tendency of the fluid to resist. Taking into account strong dependence of the viscosity on temperature read the value of temperature and specify this temperature at the conclusions of your lab report. A process of viscosity measurement, by measuring the speed of. The molecular viscosity is a property of the material that depends microscopically on bond strengths. This report discusses the methods with which the viscosity of liquid glycerin is determined, and uses the data to validate stokes law. The viscousity of viscous fluids part a introduction the aim of the experiment is to determine the viscosity of glycerine a viscous fluid by using guineaandfeather apparatus and to determine the viscosity of the glycerine by using hoeppler method the theory state that a body that moving in a fluid is acted on by a frictional force in the opposite direction of its velocity. T du dy 2 when doing any measurement of viscosity, it is necessary to report the temperature. The collected data is used to compare and contrast to the ideal binary solutions and their components. In the mks system the unit of viscosity is nsm2 whereas in the cgs system the unit of viscosity is the poise 1 poise 1dyneseccm2. Viscosity tells us the resistance of a fluid on which a force is acting.
Temperature can have a major effect on the value of the. Two different methods were employed, the first measures time of flow of several methanolwater solutions, from point a to point b. Step 1 gather four clear glass jars and fill one with water, one with corn syrup, one with cooking oil and one with honey. Molasses, for example, has a greater viscosity than water. Viscosity stokes law viscosity is a property of uids liquids and gases which determines how much resistance is experienced by an object trying to move through the uid. In the honour of hagenpoiseuille the unit of viscosity is called the poise p. Generally speaking the viscosity of a fluid increases only weakly with pressure white, 2003. Kinematic viscosity is the dynamic viscosity divided by the density typical units m2s, stokes, st.
Compare your results of the measurement of the viscosity with the accepted values. Viscosity is a measure of the resistance of a fluid which is being deformed by either shear stress or tensile stress. In this experiment we will use stokes law and the concept of terminal velocity to determine the viscosity of glycerin. Viscosity of liquids introduction this experiment focuses on measurements of different trials of various concentrations. Determination of viscosity of organic solvents procedure. Density density is defined as the amount of mass of a substance contained per unit volume. Viscosity of liquids lap report 1815 words bartleby. Determination of viscosity by ostwald viscometer the viscosity of liquid is a resistance to flow of a liquid.
Most processes are based on the use of fluids either as raw materials, reagents, or heat transfer media. Lab report use pages 3739 in the syllabus as reference for writing the full lab report. Watch the detailed viscosity of liquids science experiment step by step instructions video. Viscosity, resistance of a fluid liquid or gas to a change in shape, or movement of neighbouring portions relative to one another. The aim of the experiment is to determine the viscosity of glycerine a viscous fluid by using. The ostwald viscometer is a useful laboratory equipment to measure the viscosities of many binary solutions.
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