| Title |
A Study on the Thermal Conductivity of Carbon-Nanotube Nanofluids |
| Keywords |
탄소 나노튜브 ; 나노유체 ; 유효 열전도도 ; 클러스트 효과 ; 종횡비 Caron nanotube ; Nanofluid ; Effective thermal conductivity ; Clustering ; Aspect ratio |
| Abstract |
An experimental study was conducted to investigate the effect of the morphology of CNT(Carbon Nanotube) on the thermal conductivity of suspensions. The effective thermal conductivities of the samples were measured using a steady-state cut bar apparatus method. Enhancements based on the thermal conductivity of the base fluid are presented as functions of both the volume fraction and the temperature. Although functionalized SWNT (Single-Walled Carbon Nanotube) produced more stable and homogeneous suspensions, the addition of small amounts of surfactant to suspensions of "as produced" SWNT demonstrated a greater increase in effective thermal conductivity than functionalized SWNT alone. The effective thermal conductivity enhancement corresponding to 1.0% by volume approached 10%, which was observed to be lower than expected, but more than twice the values, 3.5%, obtained for similar tests conducted using aluminum oxide suspensions. However, for suspensions of MWNT(Multi-Walled Carbon Nanotube), the degree of enhancement was measured to be approximately 37%. It was postulated that the effect of clustering, resulting from the multiple heat-flow passages constituted by interconnecting neighboring CNT clusters, played an important role in significant enhancement of effective thermal conductivity. |