About surface tension / sludge drying, slurry drying, waste drying

KENKI DRYER is a drying apparatus and dries objects being wet. Being wet suggests a phenomenon that liquid is contacting surface of solid body, and degree of wetness can be measured from their contact angles if we know the surface tension of solid and liquid.

Then, what is surface tension?
Surface tension is energy comes from object’s characteristics which tend to make its surface as small as possible.

Surface is also called interface though, it is called interface when two phases such as gas and liquid, liquid and liquid, liquid and solid, solid and solid, or solid and gas are touching, and it is called surface especially when one of the phases is gas. Surface tension is surface free energy per unit area of surface where solid or liquid are contacting gas, and it can be said one kind of interface tensions as well.
Molecules of liquid can move comparatively freely and it forms a sphere in case there is no external force since it has characteristics which tend to make its surface area as small as possible. Between each molecule within liquid, pulling forces called intermolecular forces is acting and each molecule are pulling each other. In case of molecule at liquid surface (interface between liquid and gas) on the other hand, intermolecular forces are acting between molecule of gas though, molecule are always pulled into liquid which has larger intermolecular force because of its overwhelmingly higher density. This is surface tension and you can see that force pulling inside to shrink the surface is acting when you observe liquid. This is surface tension and you can see that force pulling inside to shrink the surface is acting when you observe liquid. 
There are several methods to measure this surface tension, and object hardly get wet when surface tension of liquid is large.
Also, surface tension gets lower as temperature get higher. This is because movement of molecules becomes more active and molecules repel each other as temperature get higher. It becomes easier to get wet as temperature get higher.
In addition, surfactant such as detergent makes surface active and surface/interface tension becomes extremely low. This surfactant makes materials easier to be mixed together even they normally cannot be, and it is used for removing oil stains of laundry, for example.
 Surface tension differs in each kind of liquid, and surface tension at celsius 20 degrees of mercury is 476.00mN/n in contract with 72.75mN/n of water’s. It can be said that mercury is easier to form a spherical body and more difficult to make something wet compared with water.
If interface tension of boundary surface between liquid and solid is known, contact angle showing degree of wetness can be calculated.

Reference web-site Surface tension Wiki 

The following is a photograph of mercury.

KENKI DRYER which is designed and manufactured based on internationally patented technologies can definitely solve troubles of drying sticky, adhesive, and viscous materials, and also of liquid slurry. For sludge drying, costs of our dryer are estimated to be retrieved in 2 or 3 years by reduced cost of industrial waste disposal. For raw material slurry drying, we recommend replacing traditional box-shaped compartment tray dryers which need laborious works of manual operation. While organic waste with high moisture content such as used tea leaves, soy pulps, food residues, livestock excretions etc. can be dried with low-temperature and without change in their components, it is possible to recycle the waste as fuels, soil conditioner, etc., to sell them with high price, and to contribute for the environment.
Because of the internationally patented technologies, our dryer has outstanding drying performance which can dry sticky, adhesive, and viscous materials, and also liquid slurry that no other dryers can take care without clogging inside of its body. Also, since its structure is simple, initial, running and maintenance costs are low. Please do compare with other company’s products. The structure is simple, therefore, it hardly breaks, it has small number of replacement parts, it is easy to be maintained, and its service life is long.
Please don’t hesitate to ask for solutions about troubles of drying sticky, adhesive, and viscous materials, and also of liquid slurry.

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