how to measure viscosity of yogurt at home

Ensure that your sample container is clean without any reside from prior tests. These fluids may also have Newtonian, pseudoplastic, or dilatant flow characteristics. For example, a food manufacturer might need to test thin, low viscosity salad dressing, as well as higher viscosity ketchup with shear thinning flow behavior. Do the quantified results of this measure allow me to identify discrepancies that I judge between two products? Measurement of the viscosity in the yogurt obtained. The measurement method used involved taking a sample out of the line and bringing it to a laboratory to analyze. sales@formulaction.com A graduated cylinder is a plastic container that has graded markings on the side that allow you to measure volume. Ensure that your spindle is clean, shaft is not bent and has not any dings or dents. They can also be used in other applications, such as raw material, slurries, and some food applications within the specified viscosity range. Figure 2 gives an overview over shear rates applied at certain applications as well as measuring methods. Pull up and as soon as the cup breaks the surface start the stop watch. Were committed to providing the world with free how-to resources, and even $1 helps us in our mission. Milk & Dairy Products; Water & Wastewater; Food & Feed; Chemical & Pharmaceuticel; Gerber Instruments; Onlineshop Yogurt is typically eaten in a semi-solid state using a spoon. An electrode that has an open junction design utilizes a gel reference electrolyte that comes in direct contact with the sample; because there is no physical junction, potential clogging is no longer an issue. This works best if the ball is small enough that the flow around the ball is truly viscous and far from turbulent. Liquid viscosity is a measure of the internal friction of a liquid. 0.05% dairy yoghurt was added to each of the samples as a starter culture . Let the pot sit, still covered, until the milk is very close to 55C (130F). There are several factors that you should consider before selecting a spindle and rotational speed: If you are trying to duplicate a method or result, use the same spindle, rotational speed, container, and sample size used in the method to be duplicated. Dynamic ViscosityAlso known as shear viscosity, defined as the resistance of one layer of a fluid to move over another layer. Yield StressThis is defined as the amount of force required for a material to start to flow. The precision of a measurement is not enough to make it relevant. Viscosity and density relate to two different properties of a liquid. An example of this type of fluid is ketchup, it will not normally pour from the bottle unless the bottle is shaken or hit with your palm. Be careful not to shear the sample while preparing through shaking, stirring or mixing as some materials (shear thinning / shear thickening) take time to recover to their resting viscosity. DilatantAlso described as shear thickening fluids, they are characterized by increased viscosity with increases in shear rate. Passive micro-rheologyis a more complex measurement of a samples rheological characteristics. RheopexyA rare non-Newtonian liquid behavior where viscosity increases over time under a constant shear force. Another type of viscometer is a bubble tube viscometer, which measures viscosity by measuring the time it takes for an air bubble to pass through a liquid in a tube. unlocking this expert answer. By signing up you are agreeing to receive emails according to our privacy policy. Step Two: Remove from heat and let cool. Record the volume in milliliters (mL). Processes with non-Newtonian fluids passing through a pump, a filter, instruments with a smaller diameter than the pipe size or those flowing through a sampling valve may be significantly affected. 1 tablespoon contains 17.81 grams of greek yogurt. The viscosity is measured from the required torque to rotate the spindle against the oil shear stress. The correct calculation of parameters related to viscosity depends on two criteria: The fluid does not glide along the plates but is in good contact with them. ", "The article explained the experiment in a very simple way. Once mature, operators empty the batch and pump the white mass to a packaging plant where it is cooled down before packaging. A company may test a product and then adjust it to build the texture they want. A rotational viscometer applies relatively weak levels of torque to a liquid sample to encourage mechanical deformation. Microfluidic rheometryis an innovative method for determining the dynamic viscosity of fluids in small sample volumes by forcing a liquid sample through amicrofluidic channelin a laminar flow. Cone and plate viscometers are often used at high shear rates and therefore allow control over the paints viscosity during application but can measure also at shear rates down to 20 sec-1 as well. They can standardize operations with all the operators on the line, allowing them to save money and get a uniform product that meets their quality standards. Figure 1 below illustrates the most frequently encountered. It is expressed in Stokes, cStokes or cm2/s. Kinematic viscosity; refers to the resistive flow of a fluid under the influence of gravity. It is a measure of the internal forces of a Fluid. This helps formulators understand what force is required to enable the products to start flowing (pump dimension, packaging pressure to exit sample from it). Home Depot to Eliminate Controversial Pay 'Rounding'. Ensure to use the same test time as many fluids change viscosity over time. Dynamic viscosity; is a measure of the shear stress per unit area required before a sample begins to deform. The time taken for the sample to travel through the capillary correlates to its kinematic viscosity. It can consider the rheological behavior of the product, which gives it an absolute character. Using your measurements, plug them into the equation. Viscosity can also be measured by applying oscillating vibrations to the sample and monitoring the damping effects of the fluid. When using a viscometer to test substances of varying viscosities it is important to ensure that your viscometer is calibrated in the viscosity range of the products that you are testing. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/d\/d0\/Measure-Viscosity-Step-1-Version-2.jpg\/v4-460px-Measure-Viscosity-Step-1-Version-2.jpg","bigUrl":"\/images\/thumb\/d\/d0\/Measure-Viscosity-Step-1-Version-2.jpg\/aid1377542-v4-728px-Measure-Viscosity-Step-1-Version-2.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"