Bubble volume control method and bubble volume controlling apparatus
AssigneeSogang University Research Foundation
InventorsGihun SON, Jaewon LEE
Life of this patent
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Abstract
Provided is a bubble volume control method and apparatus, and more particularly, to a bubble volume control method and apparatus for controlling the volume of a bubble by increasing or decreasing the volume of the bubble by emitting an ultrasonic wave having a resonance frequency corresponding to the size of the bubble located at the bottom of a container containing a liquid, such as water with bubbles composed of air, vapor, etc., toward the bubble by using an ultrasonic generator above the container, and maximizing a function of adjusting the volume of a bubble through a resonance effect by adjusting a liquid surface height of a liquid with the bubble according to a wavelength of an emitted ultrasonic wave.
Claims16
A bubble volume control method comprising, when there is a bubble of a radius R at the bottom of a container containing a liquid of a density p and a specific heat ratio γ, controlling volume of the bubble to be reduced by emitting an ultrasonic wave having a resonance frequency fN toward the bubble through an ultrasonic generator provided above a surface of the liquid to pressurize the bubble, wherein the resonance frequency fN is defined by:
- f
- N
- =
- 1
- 2
-
-
- π
-
- 1
- ρ
-
-
- R
- 2
-
- [
- 3
-
-
- γ
-
-
- p
- o
- +
- 2
-
- (
- 3
-
-
- γ
- -
- 1
- )
-
- σ
- R
- ]
- ,
- wherein p represents the density of the liquid contained in the container, R represents the radius of the bubble, Po represents an atmospheric pressure, and σ represents surface tension of the liquid.
A bubble volume control apparatus comprising:
- an ultrasonic generator;
- and
- a liquid container,
- wherein a liquid of a density p and a specific heat ratio γ is contained in the liquid container,
- the ultrasonic generator emits an ultrasonic wave toward a surface of the liquid in the liquid container, and
- when a radius of a bubble at the bottom of the liquid container is R, the ultrasonic generator generates an ultrasonic wave having a resonance frequency fN to pressurize the bubble to reduce the volume of the bubble, wherein the resonance frequency is defined by:
- f
- N
- =
- 1
- 2
-
-
- π
-
- 1
- ρ
-
-
- R
- 2
-
- [
- 3
-
-
- γ
-
-
- p
- o
- +
- 2
-
- (
- 3
-
-
- γ
- -
- 1
- )
-
- σ
- R
- ]
- ,
- wherein p represents the density of the liquid contained in the container, R represents the radius of the bubble, Po represents an atmospheric pressure, and σ represents surface tension of the liquid.
Dependencies are inferred from the claim text.