Pressure Relations in Pipe Flow of Viscous Fluid

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Discussion Overview

The discussion revolves around the behavior of pressure in pipe flow of a viscous fluid, specifically focusing on the effects of frictional losses and minor losses due to fittings and bends. Participants explore the relationship between dynamic pressure, static pressure, and total pressure, as well as the implications of these losses on fluid temperature.

Discussion Character

  • Technical explanation, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant questions how head loss due to friction and minor losses affects total pressure in pipe flow, suggesting a relationship between dynamic and static pressures.
  • Another participant asserts that losses do indeed reduce the total pressure and are converted into heat.
  • A subsequent participant inquires whether the heat generated from these losses would increase the temperature of the fluid and the pipe.
  • Another reply confirms that the fluid does heat up, with some heat being conducted away by the pipe while the rest increases the fluid's temperature.
  • A later post shifts the focus to a specific problem regarding flow rate in a hose, requesting a formulaic description.

Areas of Agreement / Disagreement

There is agreement among some participants that losses reduce total pressure and contribute to heating the fluid. However, the discussion introduces a new topic regarding flow rate in a hose, which may indicate a shift in focus rather than a consensus on the initial topic.

Contextual Notes

The discussion does not clarify the assumptions regarding the nature of the fluid or the specific conditions of the flow, which may affect the conclusions drawn about pressure and temperature changes.

Who May Find This Useful

Individuals interested in fluid dynamics, particularly those studying the effects of pressure losses in pipe systems and the thermal implications of viscous flow.

redargon
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In pipe flow of a viscous fluid, what happens to the head lost due to friction and "minor losses" (pipe bends, valves, etc).?I mean, if you decrease the dynamic pressure by reducing flow velocity, then the static pressure increases. If the dynamic pressure increases then the static pressure decreases, but the total pressure is always constant. Do losses reduce the total pressure?
 
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Yes, losses reduce the total pressure and are dissipated as heat.
 
So would the heat be dissipated into the fluid and into the pipe. ie. would the fluid temperature increase if there were fricitonal and minor losses (which i assume are frictional in nature too)?
 
Yes, fluid heats up as. A part of the heat is conducted away by the pipe & rest heats up the fluid to a higher temperature.
 
Excellent, thanks for your replies
 
Hi All
Hose ID 8mm, air pressure 0.5 kg/cm2, what will be the flowrate.
Please describe with formula.
 

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