水基碳纳米管悬浮液强制对流换热特性

Characteristics on Flow Drag and Heat Transfer of Water Based Carbon Nanotube Suspension

对水基碳纳米管(CNT)悬浮液在内径1.02 mm水平不锈钢管内的强制对流换热和流动阻力特性进行研究,考察了CNT质量分数和悬浮液温度对悬浮液强化传热和对流换热特性的影响.结果表明:CNT/水悬浮液的流动阻力特性呈现出与水相似的特性,具有常规流体的流动特性;与水相比,CNT/水悬浮液显示出较好的强化换热特性,且CNT/水悬浮液温度越高,其传热强化效果越明显;当CNT/水悬浮液温度较高时,其在对流传热中呈现出明显的纳米效应,而在常温时依然显示出常规流体的传热特性.

This paper studied the effect of fluid temperature on the forced convective flow drag and heat transfer characteristics of CNTs （carbon nanotube）-water suspension. Experiments were carried out in a horizontal steel tube with an inner diameter of 1.02 mm. No surfactant was added. The experimental results show that the flow drag characteristic of CNT suspension is almost the same as that of water. While the convective heat transfer of CNT suspensions is significantly enhanced. The fluid temperature has no effect on flow drag but has great effect on the heat transfer. The CNT-water suspension presents nanometer characteristics on convective heat transfer at high fluid temperature, while at room temperature the CNT-water suspension can be regarded as conventional fluid.