Liquid expulsion from an orifice

1. An acoustic module, comprising:

an acoustic element;

a cavity acoustically coupled to the acoustic element;

a first conductive element configured to generate a first surface charge on a first region of an interior surface of the cavity; and

a second conductive element configured to generate a second surface charge on a second region of the interior surface of the cavity,

wherein the first and second charge on the first and second regions of the interior surfaces of the cavity may be selectively applied to facilitate movement of a liquid held within the cavity.

2. The acoustic module of claim 1 , wherein the first conductive element is formed from a first electrode that is proximate to an interior surface of the cavity, and

wherein the second conductive element is formed from a second electrode that is proximate to the interior surface of the cavity and proximate to the first electrode.

3. The acoustic module of claim 2 , wherein the first and second electrodes are separated from the interior surface of the cavity by a dielectric layer.

4. The acoustic module of claim 1 , wherein:

the first charge is a positive charge resulting in a decrease in the hydrophobicity of the first region of the interior of the surface of the cavity, and

the first charge facilitates movement of the liquid toward the first region of the interior surface of the cavity.

5. The acoustic module of claim 1 , wherein:

the first charge is a positive charge resulting in a decrease in the hydrophobicity of the first region of the interior of the surface of the cavity, and

the second charge is a negative charge resulting in an increase in the hydrophobicity of the second region of the interior of the surface of the cavity, and

the first and second charge facilitates movement of the liquid toward the first region of the interior surface of the cavity.

6. The acoustic module of claim 1 , wherein the first and second conductive elements are located on a lower surface of the cavity, the acoustic module further comprising:

a third conductive element configured to generate a first surface charge on a third region of an interior surface of the cavity,

wherein the third conductive element is located on an upper surface of the cavity.

7. The acoustic module of claim 1 , further comprising:

a third conductive element configured to generate a third surface charge on a third region of an interior surface of the cavity; and

a fourth conductive element configured to generate a fourth surface charge on a fourth region of the interior surface of the cavity,

wherein the first, second, third, and fourth charges may be selectively applied to facilitate movement of a liquid held within the cavity.

8. The acoustic module of claim 1 , wherein the first and second conductive elements are formed from an electrode that substantially conforms to the shape of the cavity.

9. The acoustic module of claim 1 , wherein the first and second conductive elements are coil elements formed from a coil of conductive wire.

10. The acoustic module of claim 1 , wherein the acoustic element is a speaker element.

11. The acoustic module of claim 1 , wherein the speaker element is configured to generate an acoustic pulse that facilitates movement of the liquid within the cavity.

12. The acoustic module of claim 1 , further comprising:

a screen element located at an opening in the cavity, and wherein

the screen element is configured to selectively apply a surface charge to a surface of the screen element to modify the hydrophobicity of the surface of the screen element.

13. An electronic device, comprising:

a housing having at least one acoustic port having an orifice; and

an acoustic module coupled to the at least one acoustic port, the acoustic module comprising:

an acoustic element;

a cavity acoustically coupled to the acoustic element;

a first conductive element configured to generate a first surface charge on a first region of an interior surface of the cavity; and

a second conductive element configured to generate a second surface charge on a second region of the interior surface of the cavity,

wherein the first and second charges on the first and second regions of the interior surfaces of the cavity may be selectively applied to facilitate movement of a liquid held within the cavity.

14. The acoustic module of claim 13 , wherein the electronic device is a mobile telephone and wherein the acoustic element is one or more of: a speaker element or a microphone element.

15. The acoustic module of claim 13 , wherein the electronic device is a wearable device and wherein the acoustic element is one or more of: a speaker element or a microphone element.

16. An acoustic module, comprising:

a housing defining an acoustic port;

an acoustic element coupled to the acoustic port by an acoustic cavity; and

an array of conductive elements configured to generate a localized surface charge within the acoustic cavity, wherein

the array of conductive elements are configured to selectively apply the localized surface charge resulting in a change in the hydrophobicity of a respective region of the interior of the surface of the cavity, and

the change in hydrophobicity induces movement of the liquid along the interior surface of the cavity.

17. The acoustic module of claim 16 , wherein:

the array of conductive elements are located proximate to an interior surface of the cavity; and

the array of conductive elements are separated from the interior surface of the cavity by a dielectric layer.

18. The acoustic module of claim 16 , wherein the array of conductive elements are arranged in opposing pairs along a length of the cavity.

19. The acoustic module of claim 16 , wherein:

the array of conductive elements are configured to apply a positive charge resulting in a decrease in the hydrophobicity of a respective region of the interior of the surface of the cavity, and

the positive charge facilitates movement of the liquid toward the respective region of the interior surface of the cavity.

20. The acoustic module of claim 16 , wherein:

the array of conductive elements are configured to apply a positive charge resulting in a decrease in the hydrophobicity of a first region of the interior of the surface of the cavity, and

the array of conductive elements are configured to apply a negative charge resulting in an increase in the hydrophobicity of a second region adjacent to the first region to facilitate movement of the liquid toward the first region.