What range of frequencies can be generated by blood flow

Click For Summary

Discussion Overview

The discussion revolves around the range of frequencies generated by blood flow in the human body, particularly in the context of using these sounds for passive sensing applications. Participants explore the relationship between blood flow, heartbeats, and sound generation, as well as the implications for a project resembling ultrasound sonar.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant inquires about calculating the frequency ranges generated by blood flow, suggesting a project based on natural sound created by turbulence in blood vessels.
  • Another participant questions the clarity of the initial inquiry and proposes that the frequency could relate to heartbeats, noting the variability between maximum and minimum heart rates.
  • A different participant clarifies their intent to create a device similar to ultrasound sonar that utilizes sounds produced within the body, specifically mentioning that heartbeats are around 2Hz but not within the audible range.
  • One participant mentions that the sound associated with a heartbeat arises from turbulent blood flow and the functioning of heart valves, while also expressing curiosity about the sounds produced during breathing.

Areas of Agreement / Disagreement

Participants express differing views on the nature of the sounds produced by blood flow and their relevance to the proposed project. There is no consensus on the exact mechanisms or frequency ranges involved.

Contextual Notes

Some assumptions about the relationship between blood flow and sound generation remain unaddressed, and the discussion does not resolve the complexities of hemodynamics or the specific frequencies involved.

Who May Find This Useful

Individuals interested in biomedical engineering, acoustics, or the physiological aspects of sound generation in the human body may find this discussion relevant.

tarek1984
Messages
5
Reaction score
0
hi

i was trying to prepare for a project based on passive sensing of sound waves
By using natural sound created naturally by blood flow may be turbulence flow of blood in blood vessels

So i want to know how to calculate the frequency ranges which can be generated in the human body
 
Physics news on Phys.org
First of all I think you should rephrase your question, it sounds a bit odd. Are you trying to produce sound by the blood flow in the body which allows a person to sense heart beat? Or are you trying to use the natural heart beat that creates blood flow to detect sound waves?

From a very macro point of view, the frequency can easily be the beats per second of your heart. Thus the range would naturally be the maximum known heart rate to the minimum known heart rate of a human being which can be very confusing.

Increased rush of blood to the extremities of the body allows increased brain activity by releasing chemicals in the brain e.g. Endorphins; which might cause the detection of sound waves appear to be lower in frequency. For example, try listening to music when you have just woken up in comparison to listening to the same piece after running 3 km. You would sense a slight difference in the tempo of the sound due to the BRAIN ACTIVITY rather than the flood of blood in the vessels.

As for a more detailed example you would have to resort to hemodynamics - a study of the blood flow in the body. However, the turbulence of blood in a human body has nothing to do with the sense of sound, rather to increase the brain activity by sending more blood to the head. Therefore your project should focus on brain function rather than blood.
 
Sorry my quistion was not clear.I am tring to make something like ultrasound sonar but uses sounds created in the body .Heart beat is about 2Hz or grater but not in the audo rang but you can lesten to this sound.I think that this sound is created by the flow of blood
 
Interesting question- AFAIK, the sound you hear from a heartbeat is from the turbulent flow within the heart (as well as the valves opening and closing) during filling and ejection. Thinking about it, I'm not sure why we can hear the sound of air going into and out our lungs during a breath!
 

Similar threads

Blood flow velocity via Doppler effect
  • · Replies 1 ·
Replies
1
Views
2K
High School What sound frequencies can pass through a hole in a wall?
  • · Replies 31 ·
2
Replies
31
Views
5K
Undergrad Can a Single Speaker Effectively Direct Low Frequencies?
  • · Replies 13 ·
Replies
13
Views
3K
Fluid dynamics question (Poiseuille)
  • · Replies 5 ·
Replies
5
Views
2K
Graduate Understanding frequency calculations of an object (e.g human body)
  • · Replies 2 ·
Replies
2
Views
2K
Plasma thruster - plasma instability in magnetic nozzle
  • · Replies 0 ·
Replies
0
Views
3K
Undergrad General guidelines on the physics of flows at junctions?
  • · Replies 6 ·
Replies
6
Views
2K
Undergrad Way of producing 600kHz longitudinal waves - Piezo or siren
  • · Replies 15 ·
Replies
15
Views
3K
How Can I Create Streamlines in Blood Flow Using Velocity Vectors?
  • · Replies 2 ·
Replies
2
Views
2K
Essential Role of Blood Flow in Cooling the Human Body: Heat Transfer Problem
  • · Replies 2 ·
Replies
2
Views
4K