Method and Device for Enhancing a Process Involving a Solid Object and a Gas
a solid object and enhanced technology, applied in the field of methods and devices for enhancing a process involving solid objects and gas, can solve the problems of inherently limited in their ability to generate, obstructing heat transmission, and inability to heat flow without temperature difference, so as to increase the speed of said catalytic process, reduce reaction time, and high intensity
Inactive Publication Date: 2007-11-01
FORCE TECH
View PDF3 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Benefits of technology
"The present invention provides a sonic device and method for reducing a laminar sub-layer on the surface of an object, which can improve heat transfer and mass transport efficiency in a variety of processes involving a solid object and gas. By minimizing the sub-layer, the device can increase efficiency in heat exchange, catalytic processes, and flushing to change the composition of gases. The sonic device applies high intensity sound or ultrasound to the surface of the object, which causes a high velocity and displacement of gas molecules, resulting in increased heat conduction and reduced reaction time in the catalytic process. The device can be practical and efficient in reducing the sub-layer, even over large areas or the entire surface of the object."
Problems solved by technology
No heat flow is possible without temperature difference.
Even when the motion of the gas is fully turbulent, there exists a laminar sub-layer that obstructs the transmission of heat.
While various methods and types of apparatus have been suggested for overcoming the problem such as by means of driving the gas with sonic waves and vibrating the partition with external vibration generators, these methods while being effective to some extend, are inherently limited in their ability to generate an effective minimization of the laminar sub-layer and at the same time covering an area large enough to make the method efficient.
Likewise, the speed of a catalytic process involving a gas reacting with a catalytic surface is, among many things, limited by the interaction between the gas molecules and the catalytic surface, i.e. by the supply of reactants to and the transport of reaction products away from the catalytic surface.
Similarly, when one kind of gas or mixture of gases is actively changed to another composition of gases the time needed to flush the inner surface of the container is limited to the time it takes to change the gases in the laminar sub-layer.
However, the use of a standing wave pattern to minimize the laminar sub-layer does not give as very efficient or large reduction of the laminar sub-layer (and thereby increase in heat transfer), since the definition of a standing wave pattern includes a stationary and repeatable location of nodes over the surface.
The resonators generate acoustic vortices as the gas flows over the surface of the heat exchanger and thereby creating turbulence in the gas over the surface.
The generated turbulence will decrease the size of the laminar layer (see FIG. 2a) but the generated acoustic energy is not sufficiently high and therefore not sufficiently efficient at minimizing the sub-layer.
The arrangement gives an inefficient coupling of the ultrasound from a source / oscillator via the diaphragm and thereafter to the gas.
However, this arrangement does not address the disruption of a laminar sub-layer.
Further, this arrangement is not very suitable for generating an acoustic pressure at sufficiently high levels needed for effectively disrupting a laminar sub-layer.
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0059]FIG. 1a schematically illustrates an object having a given heat transfer to the surrounding or contacting air / gas or having a given catalytic process reaction time or having a given flushing time according to prior art.
[0060] Shown is an object (100) having a surface having a temperature of T1. A surrounding gas or a gas (500), illustrated by a broken box, contacting a relevant surface of the object (100) has a temperature of T0, where T1>T0.
[0061] According to a first aspect of the present invention, heat energy tends to migrate in the direction of decreasing temperature. The heat transfer can take place by the processes of conduction, convection or radiation. Heat is the energy associated with the perpetual movement of the molecules and temperature is a measure of the vigor of this movement. When materials at different temperatures are in contact the more vigorous molecules transfer some of their thermal energy to less vigorous ones by collisions. This is the process of he...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
| Property | Measurement | Unit |
|---|---|---|
| particle velocity | aaaaa | aaaaa |
| displacement | aaaaa | aaaaa |
| gas pressure | aaaaa | aaaaa |
Login to View More
Abstract
This invention relates to a sonic device (and a method) for enhancing a process involving a solid object and a gas, where the gas surrounds the object or at least is in contact with a surface of the object, the device comprising sonic means for applying a high intensity sound or ultrasound to at least the surface of the object, wherein the high intensity sound or ultrasound, during use of the sonic device, is applied directly in the gas that is also the medium through which the high intensity sound or ultrasound propagates to the surface of the object, whereby a laminar sub-layer at the surface of the object is reduced and / or minimized. The reduction of the laminar sub-layer provides increased heat transfer efficiency and / or increased catalytic speed and / or increased gas exchange.
Description
FIELD OF THE INVENTION [0001] The invention relates to a sonic device for enhancing a process involving a solid object and a gas by reducing a laminar sub-layer. The invention further relates to a method of enhancing a process involving a solid object and a gas by reducing a laminar sub-layer. BACKGROUND OF THE INVENTION [0002] No heat flow is possible without temperature difference. Thus, the heat flux between air / a gas and a surface of an object will be in direct proportion with the temperature difference between the gas and the surface and with the surface conductance, i.e. Φ=h(ta−ts), where Φ denotes the heat flux, h the surface conductance, ts the temperature of the surface and ta the temperature of the surrounding gas. Surface conductance is measured in W / m2K. [0003] Heat energy tends to migrate in the direction of decreasing temperature. The heat transfer can take place by the processes of conduction, convection or radiation. Heat is the energy associated with the perpetual m...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & AuthorityApplications(United States)
IPC IPC(8): G01N29/00B06B1/00B01J8/02B01J8/16B01J12/00B01J19/00B01J19/10B01J19/26F28F13/10
CPCB01J8/0278B01J8/16B01J12/00B01J19/008B01J19/10B01J19/26F28F13/10C01B2203/0233C01B2203/0805C01B2203/1241F15D1/12F28F13/02C01B3/384Y02P20/10
InventorKREBS, NIELS
OwnerFORCE TECH