Evaluation of Silica Nanofluids in Static and Dynamic Conditions by an Optical Fiber Sensor

Author(s)

Prado Soares, Marco Cesar ^[1] ; Rodrigues, Matheus Santos ^[1] ; Schenkel, Egont Alexandre ^[1] ; Perli, Gabriel ^[1] ; Arita Silva, Willian Hideak ^[1] ; Gomes, Matheus Kaue ^[1] ; Fujiwara, Eric ^[1] ; Suzuki, Carlos Kenichi ^[1]

Affiliation

^[1] Univ Estadual Campinas, Sch Mech Engn, Lab Photon Mat & Devices, BR-13083860 Sao Paulo - Brazil

• Document type: Journal article
• Source: SENSORS; v. 20, n. 3 FEB 2020.
• Web of Science Citations: 0

Abstract

This work presents an optical fiber dynamic light scattering sensor capable of simultaneously assessing concentration and flow speed of nanofluids. Silica nanoparticles (189 nm) in water were tested, yielding a sensitivity of 0.78288 x 10(3) s(-1) for static conditions. Then, the sensor was submitted to situations that simulate spatial concentration changes, offering better results than those obtained by traditional mathematical models. Finally, in flow tests, the light backscattered by the nanoparticles were collected by a fiber probe placed parallel to the streamline, whereas intensity values were processed by artificial neural networks. The sensor provides average errors of 0.09 wt% and 0.26 cm/s for concentration and speed measurements, respectively, and can be further applied to assess different types of nanofluids and inline processes. (AU)

• FAPESP's process: 17/20445-8 - Development of fiber optic sensor for reflectance and light scattering monitoring for microfluidics applied to biotechnology
• Grantee: Marco César Prado Soares
• Support Opportunities: Scholarships in Brazil - Master