Measurement of Viscosity of Nitrates/Nitrites salt by Rotating Viscometer Method (CAT#: STEM-PPA-0037-YJL)

Introduction

Molten salts have been widely used to be as one of ideal heat transfer and thermal storage media in solar power fields because of large specific heat capacity, low viscosity, wide temperature range and good compatibility to alloys. Thermo-physical properties of molten salts dramatically impact their heat transfer and thermal storage performances. Viscosity can affect the velocity distribution of molten salts fluids and determines their boundary layer thickness, which can influence the efficiency of heat transfer. There was one point to be mentioned, viscosity is also the source of the flow resistance that could increase the energy consumption of pump power.
Molten nitrates/nitrites, one kind of heat transfer and thermal storage media, have been extensively employed in concentrating solar power (CSP) systems.

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Principle Applications Procedure Materials Notes Related Products

Principle

The principle of the rotating viscometer method to measure the force acting on a rotor (torque) when it rotates at a constant angular velocity (rotational speed) in a liquid. Rotating viscometers are used for measuring the viscosity of Newtonian (shear-independent viscosity) or non-Newtonian liquids (shear dependent viscosity or apparent viscosity). Rotating viscometers can be divided in 2 groups, namely absolute and relative viscometers. In absolute viscometers the flow in the measuring geometry is well defined.
The measurements result in absolute viscosity values, which can be compared with any other absolute values. In relative viscometers the flow in the measuring geometry is not defined. The measurements result in relative viscosity values, which cannot be compared with absolute values or other relative values if not determined by the same relative viscometer method. Different measuring systems are available for given viscosity ranges as well as several rotational speeds.

Applications

Mineral oil industry; Food industry; Cosmetic/pharmaceutical industry; Petroleum industry; Chemical industry

Procedure

1. Pour the liquid into the measuring cup.
2. Insert the spindle into the liquid.
3. Rotate the spindle and measure the resistance.

Materials

• Sample Type: liquid, gel-like, or semi-solid everyday substances

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