CNT are receiving high attention for its excellent electrical, thermal and mechanical properties as an ideal filler. In the process of CNT synthesis, however, the Van der Waals force among molecules interrupts uniform distribution of particles and creates agglomeration. The Ball Milling, one of mech...
CNT are receiving high attention for its excellent electrical, thermal and mechanical properties as an ideal filler. In the process of CNT synthesis, however, the Van der Waals force among molecules interrupts uniform distribution of particles and creates agglomeration. The Ball Milling, one of mechanical approaches to mend the dispersion force, reduces the agglomeration. This research has produced two types of composite materials, PP/MWCNT and HDPE/MWCNT, and manufactured a heat exchanger out of HDPE/MWCNT, and then studied the property of thermal conductivity by time change of the Ball Milling. As the Ball Milling progresses via FE-SEM analysis, it is verified that the length of CNT shortens. Comparing to the result of heat conductivity, shortened CNT have a higher rate of contact concentration and thus develop multiple heat transfer channels. Through these channels, it becomes much easier for a phonon, a heat transfer particle, to travel. Therefore the rate of heat conductivity rises as the Ball Milling time continues until it reaches the 60 minute mark. Furthermore, as the result of creating a polymer-board type heat exchanger with the HDPE/MWCNT heating surface, which contains 4wt% from each of 0 min, 30 min, 60 min and 90 min Ball Milling processed MWCNT, and experimenting, the overall thermal resistance decreases as the time of the Ball Milling increases. Therefore it is proven that the thermal resistivity of a heat exchanger can be lowered greatly by improving the dispersion force of CNT.
CNT are receiving high attention for its excellent electrical, thermal and mechanical properties as an ideal filler. In the process of CNT synthesis, however, the Van der Waals force among molecules interrupts uniform distribution of particles and creates agglomeration. The Ball Milling, one of mechanical approaches to mend the dispersion force, reduces the agglomeration. This research has produced two types of composite materials, PP/MWCNT and HDPE/MWCNT, and manufactured a heat exchanger out of HDPE/MWCNT, and then studied the property of thermal conductivity by time change of the Ball Milling. As the Ball Milling progresses via FE-SEM analysis, it is verified that the length of CNT shortens. Comparing to the result of heat conductivity, shortened CNT have a higher rate of contact concentration and thus develop multiple heat transfer channels. Through these channels, it becomes much easier for a phonon, a heat transfer particle, to travel. Therefore the rate of heat conductivity rises as the Ball Milling time continues until it reaches the 60 minute mark. Furthermore, as the result of creating a polymer-board type heat exchanger with the HDPE/MWCNT heating surface, which contains 4wt% from each of 0 min, 30 min, 60 min and 90 min Ball Milling processed MWCNT, and experimenting, the overall thermal resistance decreases as the time of the Ball Milling increases. Therefore it is proven that the thermal resistivity of a heat exchanger can be lowered greatly by improving the dispersion force of CNT.
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