Brake Rotor Heat: Calculating Temperature for 120kg Object at 30mph

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    Brake Heat Rotor
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Discussion Overview

The discussion revolves around calculating the temperature increase of a brake rotor when stopping a 120kg object traveling at 30 mph. The scope includes theoretical considerations for design purposes, specifically for a bike brake rotor, and factors affecting heat dissipation.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • One participant seeks to understand how much a brake rotor will heat up during braking, emphasizing the need for this information in their design process.
  • Another participant provides a kinetic energy calculation, suggesting that the energy required to heat the rotor depends on the material properties.
  • A question is raised regarding how to account for heat dissipation during braking.
  • Further discussion suggests that airflow, turbulence, air temperature, and humidity are critical factors in heat dissipation, proposing that advanced simulation software could be necessary for accurate modeling.
  • One participant proposes practical testing as a potential solution, suggesting that increasing the surface area of the rotor could improve heat management.

Areas of Agreement / Disagreement

Participants express various viewpoints on the factors affecting rotor heating and cooling, with no consensus on a specific method or solution for calculating temperature increase or managing heat dissipation.

Contextual Notes

Limitations include the dependence on material properties for heat capacity calculations, the need for precise environmental conditions for heat dissipation, and the potential complexity of simulations required for accurate predictions.

Who May Find This Useful

Individuals interested in brake system design, materials science, and thermal management in engineering applications may find this discussion relevant.

IM31408
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This isn't so much a homework question but rather something I need to know in order to design something.
I need to know how much a brake rotor will heat up during braking. The force it needs to stop is a 120kg object traveling at 30 mph. I don't know any of the equations necessary to figure this out. I need to know this because I am designing a brake rotor for a bike and it cannot exceed a certain temperature. Any help would be great. Thanks.
 
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E(kin) = ½*m*v*v

m=120kg
v=14m/s (30mph)

E(kin)=11760Jouel

You need to know which material you are using. For the given material you can find how much energy you need to heat one kilogram one degree celsius (or which ever scale you crazy americans use) ;-)
 
How would I deal with heat dissipation?
 
I would think you would have to know the exact airflow and turbulance around the break, the air temp. and the air hum. You would need a big computer progran such as SolidWorks to simulate it! With a price tag of around 10.000dollers fore a single user program, it might be a little much! I think Ferrie spends millions on these calculations and simulations.
I would propose testing it! The larger the surface arrea the better (drill a lot of holes) :-)
 

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