Comparison on heat transfer performance of non-newtonian nanofluids in shell side of heat exchangers with different types of baffles

作者：Tan, Yun-Kai; He, Zhen-Bin; Zhang, Zheng-Guo^*

来源：Journal of Engineering Thermophysics, 2016, 37(4): 818-824.

• Convective heat transfer Coefficient
• Enhanced heat transfer
• Heat transfer performance
• Helical baffle heat exchangers
• Helical baffles
• Nanofluids
• Non-newtonian
• Thermal Performance

A certain amount of XG was dissolved into deionized water as basefluid, followed by adding the obtained solution into the suspension of MWCNTs as non-Newtonian Nanofluids. The heat transfer performance of non-Newtonian Nanofluids and basefluid in the shell side of helical baffle heat exchanger with low-finned tubes and segmental baffle heat exchanger with smooth tubes were experimentally measured. It can be found that both of the convective heat transfer coefficient and pressure drop of the tested fluids in these two tested heat exchangers increase with the increase of Reynolds number, and compared with the non-Newtonian basefluid, the convective heat transfer coefficients of non-Newtonian nanofluids in helical baffle heat exchanger and segmental baffle heat exchanger increase by 31.3% and 18.3% respectively, while the pressure drops of non-Newtonian nanofluids increase by 36.1%~52.6% and 35.6%~41.4% respectively. In addition, at the same Reynolds number, the integrated thermal performance of helical baffle heat exchanger with low-finned tubes is 2.78-2.93 times of that of segmental baffle heat exchanger with smooth tubes.

• 出版日期2016-4-1
• 单位华南理工大学