Particulate fouling of CuO-water nanofluid at isothermal diffusive condition inside the conventional heat exchanger-experimental and modeling

作者：Nikkhah V; Sarafraz M M^*; Hormozi F; Peyghambarzadeh S M

来源：Experimental Thermal and Fluid Science, 2015, 60: 83-95.

DOI：10.1016/j.expthermflusci.2014.08.009

• Fouling resistance
• Nanofluids
• Heat transfer
• Annular heat exchanger
• Particulate behavior

Because of potential of energy saving and wide utilizations of nanofluids in industrial and commercial aspects, sedimentation and scale formation of nanoparticles inside the heat transfer media has been an indispensible challenge. In the present work, experimental investigation is conducted on the convective boiling of dilute CuO-water nanofluids in an upward flow inside the conventional heat exchanger. Nanofluids are stabilized using the stirring, pH control and sonication processes. For different operating conditions, influences of heat and mass flux, concentration of nanofluids on scale formation in term of fouling resistance are investigated in convective and nucleate boiling heat transfer heat transfer domains. Since, particulate fouling has not been correlated for nanofluids, a new correlation based on the experimental data at isothermal/diffusion flow conditions is introduced which can predict the fouling resistance of CuO/water nanofluids with Absolute Average Deviation of (less than) 30% which implies on a fair agreement to experimental data. Since, experiments are carried out in a heat exchanger with conventional dimensions; interpreted results can be generalized and applicable for any present/future industrial heating tools engaged with nanofluids as coolant.

• 出版日期2015-1