A knife is a commonly used tool in cooking. There are many types of kitchen knives with one or more round holes near the blade or near the back. These holes on the knife body do not appear “ungraceful” but they have certain functions.
Prevents food from sticking to the knife
The round holes on the knife body will minimize the amount of food stuck on the surface of the knife. The meat will automatically fall off, so you don’t need to use your hand to separate it.
There are 2 common hole positions on the knife: at the head and along the body
Physically speaking, when we cut, the atmospheric pressure outside will cause the cut food to stick to the knife blade. Having round holes along the knife blade will solve this problem and save cooking time.
Relieves pressure when chopping, ensuring knife durability
The small holes at the knife head usually appear on large knives used for chopping bones, mincing meat, and there is only one hole. According to the explanation of experts, knives with round hole designs absorb collision and relieve pressure.
The round hole at the knife head helps relieve pressure when chopping.
Specifically, when chopping food with strong force, pressure will spread throughout the knife body and may cause vibration or breakage. With a hole at the knife head, the force will be dispersed to avoid damage and preserve the durability of the knife.
Hanging the knife up high
In addition, the round hole is also used to hang the knife for draining water before storing it neatly in a knife holder or cabinet to ensure hygiene. For families without specialized kitchen storage boxes, they can hang the knife neatly and safely, making the kitchen space tidy, organized, and at the same time saving storage space for the family.
It turns out that these simple things also help keep your kitchen knife clean, sharp, bright, and free of rust.
Frequently asked questions
The hole in a blade’s body serves a critical function – it helps reduce both air and fluid resistance as the blade moves through a substance. This is known as ‘drag reduction’. The hole also helps to create a ‘boundary layer’, which is a thin layer of slow-moving air or fluid that forms between the surface of the blade and the faster-moving air or fluid around it. This boundary layer helps to further reduce drag and improve the efficiency of the blade’s movement.
The presence of the hole allows air or fluid to pass through the blade’s body, disrupting the flow and reducing the buildup of pressure on the blade’s surface. This reduction in pressure lessens the force opposing the blade’s motion, making it easier for the blade to move through the substance with less resistance.
Drag reduction enhances the efficiency of the blade’s performance. By minimizing resistance, the blade can move more smoothly and swiftly through the air or fluid, requiring less energy to achieve the desired cutting or propulsion action. This can lead to improved fuel efficiency, increased speed, and reduced wear and tear on the blade over time.
Yes, there are two main types of drag associated with blades: profile drag and skin friction drag. Profile drag is caused by the shape of the blade and the pressure differences created as it moves through a substance. Skin friction drag, as the name suggests, is the resistance caused by the friction between the surface of the blade and the air or fluid flowing over it. The hole in the blade’s body primarily targets the reduction of profile drag.
While the hole in a blade’s body offers significant advantages in drag reduction, there can be some trade-offs. In certain applications, the hole may introduce structural weaknesses, reducing the overall strength of the blade. Additionally, the hole can impact the blade’s ability to effectively channel and direct the flow of air or fluid, which may be undesirable in some use cases.
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