Creating turbulence in a small tube

In summary, a flush mount exit is more likely to promote flow in the direction of the low pressure point at the mouth of the outlet tube.
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Dull Tool
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TL;DR Summary
My question is will this cause turbulence in the larger chamber so that the air from the Yellow Question mark area is being pulled and mixed with the air from the intake area? Is there an equation I can use to know the best depth range to test the set the smaller chamber at? See picture
Dull_tool.jpg

I have an odd question or a project I have been bouncing around in my head and I want to make sure that I am understanding the science of it all correctly. My question is will this cause turbulence in the larger chamber so that the air from the Yellow Question mark area is being pulled and mixed with the air from the intake area? Is there an equation I can use to know the best depth range to test the set of the smaller chamber at? I understand I am going to have to build protypes and get my Dr. Tyson on. I just like to set parameters so I do not have to build more units than necessary. Arrows are air flow. So air is drawn in the over lay, up the heat sink, in the heat sink, into the chamber, then out the exit tube.

I mainly want to know if this will help cool the heated area faster by drawing more heat from causing turbulence in the chamber, as apposed to the exit tube being flush with the end of the chamber.

Thank you all I hope I made it clear what I'm asking.
 
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  • #2
I read your question as should the dashed portion of the exit tube should be inserted into the chamber as-drawn if the goal is to promote turbulent flow within the chamber.

My intuition says this will be more likely (relative to the likeliehood of creating turbulence) to create a high pressure stagnation zone behind the inserted portion of the tube and tend to decrease the overall heat-transfer along the walls of the chamber. I intuit that you are better off with a flush mount exit, for what that opinion is worth. As drawn, I don't see anything that will promote flow to the right of the low pressure point at the mouth of the outlet tube.
 
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  • #3
Grinkle said:
I read your question as should the dashed portion of the exit tube should be inserted into the chamber as-drawn if the goal is to promote turbulent flow within the chamber.

My intuition says this will be more likely (relative to the likeliehood of creating turbulence) to create a high pressure stagnation zone behind the inserted portion of the tube and tend to decrease the overall heat-transfer along the walls of the chamber. I intuit that you are better off with a flush mount exit, for what that opinion is worth. As drawn, I don't see anything that will promote flow to the right of the low pressure point at the mouth of the outlet tube.
Ty I can’t remember what it’s called but I was trying to do the old put the fan a few feet from the window trick to improve the air movement in the chamber…. I’m sorry I just had an epiphany I got to go jot this down before my sleep demanding brain forgets. Thank you you helped more than you know.
 
  • #4
Go to 14:30 in this video to see how this guy made his intakes, they seemed to do what he wanted.

Mikek
 
  • #5
Dull Tool said:
TL;DR Summary: My question is will this cause turbulence in the larger chamber so that the air from the Yellow Question mark area is being pulled and mixed with the air from the intake area? Is there an equation I can use to know the best depth range to test the set the smaller chamber at? See picture

View attachment 321957
I have an odd question or a project I have been bouncing around in my head and I want to make sure that I am understanding the science of it all correctly. My question is will this cause turbulence in the larger chamber so that the air from the Yellow Question mark area is being pulled and mixed with the air from the intake area? Is there an equation I can use to know the best depth range to test the set of the smaller chamber at? I understand I am going to have to build protypes and get my Dr. Tyson on. I just like to set parameters so I do not have to build more units than necessary. Arrows are air flow. So air is drawn in the over lay, up the heat sink, in the heat sink, into the chamber, then out the exit tube.

I mainly want to know if this will help cool the heated area faster by drawing more heat from causing turbulence in the chamber, as apposed to the exit tube being flush with the end of the chamber.

Thank you all I hope I made it clear what I'm asking.
You asked if there was an equation used to determine turbulence in flow and there is one. You might want to look into the Reynolds Number. https://www.engineeringtoolbox.com/reynolds-number-d_237.html
 

FAQ: Creating turbulence in a small tube

What factors influence the onset of turbulence in a small tube?

The onset of turbulence in a small tube is primarily influenced by the Reynolds number, which is a dimensionless quantity defined as the ratio of inertial forces to viscous forces. Factors that affect the Reynolds number include the fluid's velocity, the tube's diameter, and the fluid's viscosity and density. Typically, turbulence begins to occur when the Reynolds number exceeds a critical value, around 2000 to 4000 for flow in a circular tube.

How can turbulence be artificially induced in a small tube?

Turbulence can be artificially induced in a small tube by introducing disturbances or obstacles into the flow. This can be achieved by using roughened surfaces, placing obstacles like grids or screens within the tube, or by injecting fluid at varying velocities. These methods disrupt the laminar flow and promote the transition to turbulence.

What are the practical applications of creating turbulence in a small tube?

Creating turbulence in a small tube has several practical applications, including enhancing heat transfer in heat exchangers, improving mixing in chemical reactors, and optimizing fluid delivery in medical devices. Turbulent flow increases the rate of heat and mass transfer, which can be beneficial in various industrial and biomedical processes.

How does tube diameter affect the transition to turbulence?

The diameter of the tube plays a significant role in the transition to turbulence. A smaller diameter increases the viscous forces relative to inertial forces, which can delay the onset of turbulence. Conversely, a larger diameter tends to promote earlier transition to turbulence. The critical Reynolds number for turbulence onset is also dependent on the tube diameter.

What measurement techniques are used to study turbulence in a small tube?

Several measurement techniques are used to study turbulence in a small tube, including hot-wire anemometry, laser Doppler velocimetry (LDV), and particle image velocimetry (PIV). These techniques allow for the precise measurement of velocity fields and turbulence characteristics. Additionally, pressure sensors and flow visualization methods, such as dye injection, can provide insights into the flow behavior within the tube.

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