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Summary

This summary is machine-generated.

A new optical method combines two-photon laser-induced fluorescence (2p-LIF) and two-color laser-induced fluorescence (2CLIF) for precise temperature mapping in complex liquid flows. This technique efficiently captures transient temperature dynamics in two-phase systems.

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Area of Science:

Fluid Dynamics
Optical Measurement Techniques
Heat and Mass Transfer

Background:

Accurate temperature measurement is vital for understanding heat and mass transfer in complex two-phase flows.
Existing methods may face limitations in capturing instantaneous temperature dynamics in such environments.

Purpose of the Study:

To introduce a novel optical approach for instantaneous temperature mapping in complex liquid media.
To demonstrate the effectiveness of this technique in analyzing transient temperature dynamics.

Main Methods:

Utilized a combination of two-photon laser-induced fluorescence (2p-LIF) and two-color laser-induced fluorescence (2CLIF).
Employed Kiton Red (KR) and Rhodamine 560 (R560) as fluorescent dyes.
Achieved a temperature sensitivity of 1.54%/°C over a temperature range of 17-60°C.

Main Results:

Successfully mapped two-dimensional transient temperature dynamics during the heating and degassing of water.
Demonstrated the efficiency and robustness of the 2p-2CLIF technique.
Validated the optical approach for complex liquid media.

Conclusions:

The novel 2p-2CLIF method provides an effective tool for instantaneous temperature measurement in complex liquid media.
This technique offers a robust solution for studying transient scattering media and high-speed two-phase flows.
Advances the field of optical temperature measurement for fluid dynamics research.