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Inferior heat transfer efficiency and severe fouling precipitation have been the troublesome problems for shell-and-tube heat exchangers. As a typical type of tube insert, the helical blade rotors (HBRs) can achieve heat transfer augmentation and fouling mitigation in heat exchanger. In this work, the numerical simulation regarding to the anti-fouling property of HBRs in circular tube was conducted. The numerical method was verified accurate in comparison with the results in literature prior to the simulation. The results showed that in the process of the crystallization of the fouling the deposition rate decreased and the removal rate increased, and eventually they tended to be stable and reached a dynamic balance; the deposition rate, the removal rate, the net rate and the thermal resistance in tube with HBRs was lower than that in smooth tube, which means that inserting HBRs into the circular tube can effectively prevent the deposition of crystallization fouling; moreover, the mass fraction of CaCl2 in tube with HBRs was lower than that in smooth tube, and in tube with HBRs it was not just lower near the tube wall but also near the HBRs, which illustrate that the HBRs can enhance the mass transfer of Ca in circular tube, and the mass transfer of Ca towards the HBRs is enhanced, while the mass transfer towards the tube wall is weakened.

Numerical Simulation on the Anti-fouling Property of Helical Blade Rotors in Circular Tube