Phase-transition temperature determination using optical spectroscopy in a rotating flow inside a scrape surface crystallizer

Carlos A. Acosta; Amar Bhalla; Ruyan Guo

doi:10.1117/12.2567456

20 August 2020 Phase-transition temperature determination using optical spectroscopy in a rotating flow inside a scrape surface crystallizer

Carlos A. Acosta, Amar Bhalla, Ruyan Guo

Author Affiliations +

Proceedings Volume 11498, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications XIV; 1149804 (2020) https://doi.org/10.1117/12.2567456
Event: SPIE Optical Engineering + Applications, 2020, Online Only

Abstract

Optical techniques offer a practical approach to characterize fluid dynamics due to the complicated nature of the mathematical equations that describe turbulent flows. However, experimental setups such as particle image velocimetry are often restricted to studies with steady flows moving through channels with clear walls to detect the signals from lasers using optical receivers and particles that reflect light. For non-isothermal unsteady flows in scraped surface crystallazers, the signal detecting process is not trivial due to the interference caused by the rotating shaft and the scraper blades that homogenize the solution in the mixing chamber. Also, the cooling jacket installed on the periphery of the agitator obstructs the field of view impeding the study of the interrogation region. The goal of this investigation was to determine the phase-transition temperature of a multi-phase unsteady flow in a scraped surface crystallizer using optical spectroscopy in the UV-VIS range. Temperature, pressure, and spectroscopy measurements were measured in-situ to characterize the mixture by its physical properties to obtain a correlation between the optical signatures before and after the glass-transition temperature. Results showed that optical absorbance successfully detected the physical variations in the phase- transition process of the unsteady flow.

Conference Presentation

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Carlos A. Acosta, Amar Bhalla, and Ruyan Guo "Phase-transition temperature determination using optical spectroscopy in a rotating flow inside a scrape surface crystallizer", Proc. SPIE 11498, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications XIV, 1149804 (20 August 2020); https://doi.org/10.1117/12.2567456

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