Potato's nest 2022-09-29 12:06
I am Potato, a post-80s who loves life!
Click above [Follow] Don’t get lost!
share different interesting physics knowledge!
htmlThe weather in Chengdu at the end of August was still around 40 degrees. The veritable autumn tiger was only more than ten degrees by September. It was too late to drink the cold water. It was time for the thermos to come on!
Soak wolfberry in a thermos cup, and you have to be middle-aged!
Everyone has all kinds of thermos cups. Some may be insulated, while others may not. So what factors are related to the warm-insulated cup?
thermos cup developed from thermos bottles, and its insulation principle is basically the same as that of thermos bottles. In 1892, chemist James Dewar made a double glass container and coated the inner glass wall with silver, then took out the air between the double glass and applied for a patent, so the thermos bottle is also called the Dewar bottle.
thermos cup, simply put, is a cup that can be insulated. It is generally a water container made of ceramic or stainless steel and a vacuum insulation layer. It has a cover on the top and is sealed tightly. The vacuum insulation layer can delay heat dissipation of liquids such as water and other liquids contained inside and realize heat insulation.
heat is mainly transmitted in three ways: heat convection, heat conduction , and heat radiation . There is no transfer medium in the vacuum insulation layer, so it effectively suppresses heat convection and heat conduction. At the same time, the inner layer of the vacuum layer reflects heat back into the thermos cup by plating the reverse heat layer to achieve insulation.
The above figure shows two common thermos structures. The implementation of tailless vacuum welding technology reduces the probability of air leakage in the vacuum interlayer, achieving higher efficiency insulation. At the same time, vacuum thermos is generally equipped with a resin cup head to achieve a good sealing effect.
Through the analysis of the insulation principle, we can find that the thermos cup mainly uses vacuum and the reflection of heat from the plating layer to achieve insulation, regardless of the sealing effect of the bottle mouth. The key factors affecting the insulation effect are the vacuum degree of the vacuum layer and the heat reflection ability of the coating. These factors are mainly determined by the material process during the manufacturing process of the thermos cup.
Now learn it! Use it quickly!
Have you found the answer to today's question?
Thank you for following Potato, see you next time!
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-