Ultrasonic washing machines wash clothes quickly with very
little energy. Instead of Ultrasonic, the sound heard in washing machines can
be used. A cylinder containing an electromagnet that can generate a high
magnetic field is installed on one side of the tank containing the dirty
clothes and the soap solution.
One end of the cylinder is inside the tank. This end is
covered with a jaw like a convex bow on both sides. This jaw can be made to
vibrate with the help of an electromagnet with a vibrating rod. When this jaw
vibrates 100 times per second in the soap solution, it removes various types of
dirt adhering to the fabric.
This reduces the time taken for washing significantly. Ultrasonic
washing machines have many advantages, for example, they are useful for washing
woollen clothes. Woollen clothes are stained with grease, oil and some organic
substances. To remove such stains, a soap solution with high alkali content has
to be used. This weakens the fibres of the fabric.
When using Ultrasonic for washing, a neutral solution can be
used instead of a soap solution so that the fibres of the fabric are not
affected. The hydrogen peroxide released when using Ultrasonic whitens the
fabric. Also, Ultrasonic completely destroys the microorganisms growing on the
dirty fabric during washing. This property of ultrasonics is used to remove
stains deposited in steam tanks and smoke ducts.
Ultrasonic removes stains deposited in inaccessible heights
and narrow holes. Ultrasonic is ideal for cleaning surfaces in metal parts used
in radio valves, as well as the micro-elements of wristwatches and gear
assemblies.
Ultrasonic cleaning can also be easily used in robotic floor
cleaning, which will make your home much cleaner.
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Ultrasonic drying
The rate of evaporation of a liquid depends on the air
pressure and the turbulent motion of the gas at the liquid-air interface. Ultrasonics
can accelerate the drying process by affecting both of these factors.
When concentrated Ultrasonic waves are incident on a moist surface,
they alternately condense and decondense the air near the surface. This forces
the moisture out and expels it through the ambient air. Although infrared rays
are used for drying because they are thermal rays, ultrasonic drying is faster
than infrared drying.
In chemical technologies, materials such as activated carbon, alumina, and silica gel are used for drying. Ultrasonic drying is simpler and more efficient than these. An alternative method to thermal drying is ultrasonic drying.