Why Viscosity Matters: The Science Behind Everyday Products

01-08-2024

Have you ever squeezed a toothpaste tube and wondered how it gets that perfect consistency? Or tried to pour honey and been amazed by its resistance to flow? These everyday experiences are all thanks to viscosity – a property that determines a liquid's thickness or resistance to flow.

1st August 2024

Have you ever squeezed a toothpaste tube and wondered how it gets that perfect consistency? Or tried to pour honey and been amazed by its resistance to flow? These everyday experiences are all thanks to viscosity – a property that determines a liquid's thickness or resistance to flow.

Grease selection is always a very important topic to consider for industrial applications because ensuring use of the proper grease can increase equipment efficiency and lifetime and reduce wear. Not all greases are formulated the same and some are much better than others for certain specific applications. This article will explain the most important criteria for grease selection and will give insight into which major applications will require which type of grease or grease performance characteristics.

The resistance to flow of a Liquid refers to Viscosity and it depends on the shear stress and shear rate. Viscosity can be measured using a simple formula:

viscosity = shear stress / shear rate

The SI unit of viscosity is poiseiulle (PI). Its other units are newton-second per square metre (N s m-2) or pascal-second (Pa s.)
Measuring and study of the flow of matter, primarily in a fluid state refers to Rheology. It involves measuring the viscosity of a fluid under conditions of alternating shear stress. This method is often used to study the flow behavior of complex fluids such as polymers, emulsions, and suspensions.

Types of Viscosity

Viscosity is the measure of fluid's friction to its flow. There are two ways to measure the fluid's viscosity :

  • Dynamic Viscosity (Absolute Viscosity)
  • Kinematic Viscosity

When fluid's resistance to flow is measured when external force is applied is Dynamic Viscosity, whereas measuring resistive flow of a fluid under the weight of gravity is Kinematic viscosity.

The K23900 complies with ASTM D445, D6074, D6158, and other methods. The K23900 features:

  • - Stainless Steel Bath Construction
  • - Dual Digital Displays show setpoint and actual bath temperature
  • - Selectable temperature scale - Fahrenheit or Celsius
  • - Multi-point temperature calibration
  • - Integrated redundant overtemperature and low liquid level cut-off circuitry
 
Kinematic Viscosity Bath (also called KV Bath) is an instrument used to determine the Kinematic Viscosity of a Fluid with help of a glass capillary Viscometer maintained at a constant temperature.
  • Constant temperature bath with advanced temperature control circuitry for convenient.
  • Microprocessor PID circuitry assures precise, reliable temperature control within ASTM specified stability and uniformity throughout the operating range of the bath.
  • Simple push-button controls and dual digital displays permit easy setting.
  • The bath accommodates seven glass capillary viscometers of various types.
  • Viewing the viscometers is made easy by LED illumination inside the bath and a baffle that provides a background for easy viewing.
  • Temperature control uniformity is assured by an integrated stirrer and baffling system for uniform bath temperature distribution.

Connection of the built-in cooling coil to tap water or a recirculating water chiller facilitates temperature control at ambient or below ambient temperatures.
Kinematic viscosity is expressed in units of centistokes (cSt) or square meters per second (m²/s).

Why Measure Viscosity?

  • Quality control: Ensuring product consistency.
  • Product development: Creating products with desired textures.
  • Process optimization: Improving manufacturing efficiency.
  • Research and development: Understanding material behavior.

Industrial Applications of Koehler’s Kinematic Viscosity Bath

A kinematic viscosity bath is a super useful tool in many different industries. It helps measure how thick or thin a liquid is very precisely, which is important for lots of things.

Food and Drinks

Thickness matters in the food industry! It affects how quickly things move through pipes, how long it takes for things to dry or set up, and even how food feels in your mouth. Keeping the thickness consistent means the food quality is good and things run smoothly in the factory.

Glues and Sticky Stuff

How well glue works depends on how thick or thin it is. If it's too thin, it runs everywhere. If it's too thick, it's hard to use. Measuring the thickness helps glue makers create glues that work perfectly for different jobs.

Petroleum Industry

In the oil industry, thickness is important for oil that keeps machines running smoothly. It also helps design pipes and tanks to store oil.

Building and Construction

Thickness matters in the food industry! It affects how quickly things move through pipes, how long it takes for things to dry or set up, and even how food feels in your mouth. Keeping the thickness consistent means the food quality is good and things run smoothly in the factory.

Lotions and Makeup

How thick or thin lotions and makeup are affects how they feel and how easily they spread.Measuring the thickness helps make sure these products are pleasant to use.
Koehler's kinematic viscosity bath creates a perfect environment to measure how thick or thin liquids are, which helps all these industries make better products and work more efficiently.
Interested in knowing more about the Viscometers? Contact our experts here.

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