Due to this internal friction, energy is required to move the liquid and viscosity is the measure of the resistance to flow. All fluids have an internal friction between molecules, which determines how well fluid flows. Viscosity is perceived as 'thickness' or resistance to pouring, but there is more to viscosity than this. Blast Hose, Nozzle Holders and Couplingsĭeepest condolences to our colleagues and the people of the United Kingdom for the passing of Her Majesty Queen Elizabeth II.Qualicoat Powder Coating Inspection Kit.It can also be a good choice for those who need to test volatile, toxic, or air-sensitive products. The electro magnetic spinning viscometer is an excellent choice for those who need to test with an extremely small sample size, ensure sterility during testing, or prevent cross-contamination. They are capable of measuring Newtonian products, but are the more obvious choice for those with non-Newtonian products. These sturdy, touch-screen instruments are easy to use and can be adapted to measure the viscosity of almost any product. Our rotational viscometers are capable of measuring a wide viscosity range in one instrument with a variety of spindles. Choose the right Viscometer instrument for you Electro Magnetic Spinning Viscometers generate a magnetic field that moves a small sphere within the sample. Rotational Viscometers measure the torque required to turn a spindle in a sample at a set speed. The amount of force exerted on the substance to induce flow and the amount of time for which that force is exerted can both affect the viscosity of the substance.Īt Scientific Gear we offer two types of viscometers that are used to measure dynamic viscosity. When dealing with dynamic viscosity one is usually testing non-Newtonian fluids, which are affected by more than changes in temperature. These viscometers are generally used for measuring Newtonian fluids, which only change viscosity with changes in temperature. Others measure how long it takes for an object to fall a certain, defined distance within the substance. For instance, some kinematic viscometers test how long it takes for a fluid in one capillary to flow into another capillary. Kinematic viscometers measure the time it takes for gravity to work on a substance. In a dynamic viscosity measurement, the force is generated by something external (i.e. In a kinematic viscosity measurement, this force is gravity. Sheer stress is the amount of force required to physically move or distribute molecular layers of a fluid in relation to one another. In a discussion about viscosity, this concept is also known as shear stress. It is, however, always important to note the temperature of a product in relation to the viscosity measurement. For others, the variability can be minimal. small changes in temperature equal big changes in viscosity). For some products, this variability can be more drastic (i.e. Viscosity always changes with changes in a product's temperature. Temperature, type and amount of force, and time in flow are perhaps the three most important of these factors. Several factors affect the viscosity of a product. The speed at which the layers move is called shear rate. How well a substance flows depends on the ability of the molecular layers of the substance to move in relation to one another. Viscosity is a measure of how hard it is to force a substance into flow.
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