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Cooling Efficiency According to Shape Changes to the Straight Ventilation Hole in Carbon-Ceramic Brake Disks

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Abstract

In this study, in order to examine the cooling efficiency of a carbon-ceramic brake disk, the temperature distribution of the disk, depending on the AMS (Auto-Motor-Sport) Fade mode, was analyzed using a numerical method. Two brake disks with different straight ventilation hole shapes were considered. The ventilation holes configuration was changed from base models in order to find a higher cooling efficiency disk design. In the Model A disk, the mean temperatures of the mid-plane and the entire disk, at the AMS Fade mode end time decreased 1.9 oC and 3 oC, hole length respectively. This was done by decreasing the length of the a2 hole from 94 mm to 59 mm. When a2 hole length was increased from 94 mm to 128 mm, the mean temperature of the entire disk and the disk mid-plane increased 3.7 oC and 16.2 oC, respectively. This was due to the increased affined air stagnation in the disk. In the Model B disk, after removing stagnation region of the b2 hole, the hole diameter expanded from 13 mm to 17.6 mm. As a result, the mean temperature of the entre disk and the mid-plane decreased 2.8 oC and 18.7 oC, respectively, (compared to the base model). As a result, increasing the surface area of the ventilation holes gave a higher cooling efficiency.

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Abbreviations

a:

ventilation hole of the model A disk

A:

inlet area, m2

AMS:

auto motors and sport

b:

ventilation hole of the model B disk

C:

clearance

Cp:

specific heat, J/kg·K

D:

disk diameter, mm

h:

heat transfer coefficient, W/m2·K

k:

thermal conductivity, W/m·K

P:

pressure, Pa

R:

radius, mm

Re:

reynolds number

S:

shaft, source term

T:

temperature, K or °C

Tm :

mean temperature of the disk, K or °C

Tm.e :

mean temperature of the entire disk, K or °C

Tm.m :

mean temperature at the mid-plane of the disk, K or °C

V:

velocity, m/s

α:

thermal diffucivity, m2/s

ΔT:

increasing of temperature, °C

μ:

coefficient of viscosity, kg/m·s

ρ:

density, kg/m3

τ:

shear stress, N/m2

τij:

Reynolds-stress tensor, N/m2

ω:

angular velocity, rad/s

1,2,3:

hole number

∞:

atmospheric region

a:

air

avg:

average

eff:

effective

h:

enthalpy

m:

mean

in:

inlet

out:

outlet

r:

radius

sta:

static pressure

t:

turbulent flow

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Authors and Affiliations

  1. School of Mechanical, Mechanical Engineering, Chonbuk National University, Jeonbuk, 54896, Korea

    Dong Guk Ko & Suck Ju Yoon

  2. School of Mechanical, Mechanical Design Engineering, Chonbuk National University, Jeonbuk, 54896, Korea

    Hamada Mohamed Abdelmotalib & Ik-Tae Im

  3. Ceramic Composites Team, DACC Carbon, 30 Unam-ro, Deokjin-gu, Jeonju-si, Jeonbuk, 54853, Korea

    Dong Won Im

Authors
  1. Dong Guk Ko
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  2. Hamada Mohamed Abdelmotalib
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  3. Ik-Tae Im
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  4. Dong Won Im
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  5. Suck Ju Yoon
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Correspondence to Suck Ju Yoon.

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Ko, D.G., Mohamed Abdelmotalib, H., Im, IT. et al. Cooling Efficiency According to Shape Changes to the Straight Ventilation Hole in Carbon-Ceramic Brake Disks. Int.J Automot. Technol. 19, 1103–1110 (2018). https://doi.org/10.1007/s12239-018-0108-y

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  • DOI: https://doi.org/10.1007/s12239-018-0108-y

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