Temperature measurement of air convection using a Schlieren system

Alvarez-Herrera, C.; Moreno-Hernández, D.; Barrientos-García, Bernardino; Guerrero-Viramontes, J.A.

doi:10.1016/j.optlastec.2008.07.004

Cited by 52 publications

(32 citation statements)

References 13 publications

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“…Schlieren imaging [40][41][42][43] ) of these systems would be valuable but are beyond the scope of this investigation. Finally, the data presented thus far indicates that the cluster dynamics and streamer formation characteristics in oil are similar to those seen in water but with a number of interesting caveats (for example, local fluid heating and the narrow nature of the extended streamer observed).…”

Section: Please Do Not Adjust Margins Please Do Not Adjust Marginsmentioning

confidence: 99%

Cavitation clusters in lipid systems – surface effects, local heating and streamer formation

Birkin

Foley

Truscott

et al. 2017

Phys. Chem. Chem. Phys.

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Cavitation clusters and streamers are characterised in lipid materials (specifically sunflower oil) and compared to water systems. The lipid systems, which are important in food processing, are studied with high-speed camera imaging, laser scattering and pressure measurements. In these oils, clusters formed at an aged (roughened) tip of the sound source (a piston like emitter, PLE) are shown to collapse with varied periodicity in relation to the drive amplitude employed. A distinct streamer (an area of increased flow emanating from the cavitation cluster) is seen in the lipid media which is collimated directly away from the tip of the PLE source whereas in water the cavitation plume is visually less distinct. The velocity of bubbles in the lipid streamer near the cluster on the order of 10 m s -1. Local heating effects, within the streamer, are detected using a dual thermocouple measurement at extended distances. Viscosity, temperature and the outgassing within the oils are suggested to play a key role in the streamer formation in these systems.

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Section: Please Do Not Adjust Margins Please Do Not Adjust Marginsmentioning

confidence: 99%

Cavitation clusters in lipid systems – surface effects, local heating and streamer formation

Birkin

Foley

Truscott

et al. 2017

Phys. Chem. Chem. Phys.

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“…The method for measuring temperature in a fluid flow has been fully reported in [10]. In this work, we omit the details about the technique for measuring temperature.…”

Section: A Temperature Measurement Methodsmentioning

confidence: 99%

“…(5). In [10], there is a detailed description of the procedure used in this work to determine temperature measurements.…”

Section: A Temperature Measurement Methodsmentioning

confidence: 99%

“…Therefore, variation in the comparison can be found mainly in the unconfined convective fluid flow, because it is perturbed by the surrounding air. However, a comparison can be done close the surface where the fluid flow fluctuations are not so high, and where the behavior can be considered as nearly 2D [10]. For the confined fluid flow, comparison between schlieren and thermocouple measurements can be done at different distances from the surface of the table, since the fluid flow is nearly 2D.…”

Section: A Temperature Measurementmentioning

confidence: 99%

“…As can be noted, the schlieren technique is one of the techniques where integration along the illumination path is required, but in spite of that drawback, the technique has been used in different applications; for example, it has been widely used to quantify temperature in fluid flows. A number of well-known practical techniques, such as color schlieren [3][4][5], background schlieren [6,7], and calibration schlieren [8][9][10], have been utilized.…”

Section: Introductionmentioning

confidence: 99%

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Measurement of temperature and velocity fields in a convective fluid flow in air using schlieren images

2013

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A convective fluid flow in air could be regulated if the physical process were better understood. Temperature and velocity measurements are required in order to obtain a proper characterization of a convective fluid flow. In this study, we show that a classical schlieren system can be used for simultaneous measurements of temperature and velocity in a convective fluid flow in air. The schlieren technique allows measurement of the average fluid temperature and velocity integrated in the direction of the test beam. Therefore, in our experiments we considered surfaces with isothermal conditions. Temperature measurements are made by relating the intensity level of each pixel in a schlieren image to the corresponding knife-edge position measured at the exit focal plane of the schlieren system. The same schlieren images were also used to measure the velocity of the fluid flow by using optical flow techniques. The algorithm implemented analyzes motion between consecutive schlieren frames to obtain a tracked sequence and finally velocity fields. The proposed technique was applied to measure the temperature and velocity fields in natural convection of air due to unconfined and confined heated rectangular plates.

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Study of Temperature Distribution Over a Stirling Engine by Using the Schlieren Technique

Alvarez-Herrera

Moreno-Nieto

Murillo-Ramírez

2016

Emerging Challenges for Experimental Mechanics in Energy and Environmental Applications, Proceedings of the 5th International S

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Temperature measurement of air convection using a Schlieren system

Cited by 52 publications

References 13 publications

Cavitation clusters in lipid systems – surface effects, local heating and streamer formation

Cavitation clusters in lipid systems – surface effects, local heating and streamer formation

Measurement of temperature and velocity fields in a convective fluid flow in air using schlieren images

Study of Temperature Distribution Over a Stirling Engine by Using the Schlieren Technique

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