capillary viscometer and its typesr.pptx

Capillary viscometer and its application In cosmetic and pharmaceutical.

1. Smt . Maherbanu college of science & commerce Akola . Presented by : Munawwar Kaunain Guided by : Prof.chanchal rathi ma’am Class : B . Tech( cosmetics ) 3 rd year sem – 5 th Topic : capillary viscometer

2. What is capillary viscometer ????? Introduction 01 Principle behind capillary viscometer 02 ( Mathematical expression) & formula Types of Capillary viscometer , working 03 Application of capillary viscometer 04 P O I N T S T O C O V E R

3. INTRODUCTION What is capillary Viscometer ?? It is a specialized device or instrument used for determination of viscosity or flow properties of Newtonian fluids only . Both dynamic & Kinametic viscosity obtained It is mostly stabilized for low viscous liquids..

4. Principle behind capillary viscometer It is based on poiseullie’s law . The Method of measurement that measures time taken for defined quantity of fluids to flow through a capillary with known diameter and length quantity and then compared with a time required to flow by a liquid of known viscosity. Usaully used water to determine the viscosity of unknown liquid.

5. Ostwald viscometer Suspended level viscometer Types of viscometer

6. Ostwald viscometer Oswald viscometer is also known as u- tube viscometer. A device which is used to measure the viscosity of the liquid having kown density. This device named after Wilhelm Ostwald .

7. Mathematical expressions Determination of viscosity of unknown liquid . According to poiseuilles law the relationship between flow of liquid and capillary viscometer describe as Where, n2 = viscosity of unknown liquid n1 = viscosity of the known liquid t2 = time of flow of uknown liquid t1= time of flow of known liquid P1 = density of known liquid P2 = density of unknown liquid liquid N = viscosity of liquid 1 poise r = radius of the inside diameter capillary ,cm t= the time of flow in sec ∆p = pressure head dyne /cm2 L = length of the capillary , cm V = volume of the liquid flowing cm3

8. Working of Ostwald viscometer A clean and dry Ostwald viscometer should be selected and fixed firmly to a stand in a vertical position . With the help of pipette a fixed amount of water is transferred through a wide limb . Through the rubber tube water is sucked Through the upper level water mark water allowed to flow down. When the water meniscus reach Mark ‘A’ the stop watch started and hence water flow &reach Mark ‘B ‘ then the stop to take out reading .

9. Suspended level viscometer It is a modified from of Ostwald viscometer. In it third vertical arm is attached to the bulb of the capillary part of the right arm Liquid is introduced in the Viscometer through the left arm in quantity sufficient to fill the bulb in the left arm. Suspended level viscometer

10. Advantages and disadvantages Measure precise viscosities for many diverse fluids. Small $Portable Inexpansive Easy to use Can use a wide variety of capillary tubes on same viscometer No single tube is suitable for all viscosities Basic model can only be used for Translucent fluids. Difficult to clean the capillary tube

11. Application of capillary viscometer They are also used for jams & syrups that are used for food preparations to determine consistent batches 1 3 4 2 Used in quality control process in formulation or evaluation of pharmaceutical system In chemical industry Measured the fuel and petroleums as well as seals and lubricant to evaluate how they does work in different temperature In food preparations In cosmeceutical For emulsion,suspension and for low viscous fluid.