Measurements of heat transfer enhanced by the use of transverse vortex generators

Mikielewicz, Dariusz; Stasiek, A.; Jewartowski, Marcin; Stąsiek, J.

doi:10.1016/j.applthermaleng.2011.11.013

Cited by 10 publications

(2 citation statements)

References 44 publications

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“…Geometry (b) gave the best overall heat transfer enhancement. More results can be found in [27]. Transverse vortex generators enhance heat transfer by several hundred percent but only for certain Reynolds numbers.…”

Section: Augmented Heat Transfer-recent Developments At Gutmentioning

confidence: 91%

The Use of Liquid Crystal Thermography in Selected Technical and Medical Applications—Recent Development

Stąsiek¹,

Jewartowski²,

Kowalewski³

2014

JCPT

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Thermochromic liquid crystals (TLC) and true-colour digital image processing have been successfully used in non-intrusive technical, industrial and biomedical studies and applications. Thin coatings of TLC at surfaces are utilized to obtain detailed temperature distributions and heat transfer rates for steady or transient processes. Liquid crystals also can be used to make the temperature and velocity fields in liquids visible by the simple expedient of directly mixing the liquid crystal material into the liquid (water, glycerol, glycol, and silicone oils) in very small quantities to use as thermal and hydrodynamic tracers. In biomedical situations, e.g., skin diseases, breast cancer, blood circulation and other medical application, TLC and image processing are successfully used as an additional non-invasive diagnostic method especially useful for screening large groups of potential patients. The history of this technique is reviewed, principal methods and tools are described and some examples are presented. Also steady-state and transient liquid crystal thermography (LCT) is used to measure local heat transfer on a plate equipped with transverse vortex generators. Automated evaluation allows determining the heat transfer coefficient without arbitrary influence of human interpretation.

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Section: Augmented Heat Transfer-recent Developments At Gutmentioning

confidence: 91%

The Use of Liquid Crystal Thermography in Selected Technical and Medical Applications—Recent Development

Stąsiek¹,

Jewartowski²,

Kowalewski³

2014

JCPT

View full text Add to dashboard Cite

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“…Furthermore, liquid crystal thermography assisted by particle image velocimetry is an excellent and recognized measurement method used in the study of advanced thermal-flow processes in major world-wide research centers [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Modeling of Passive and Forced Convection Heat Transfer in Channels with Rib Turbulators

2021

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The main goal of the research presented in this paper was the experimental and numerical analysis of heat enhancement and aerodynamic phenomena during air flow in a channel equipped with flow turbulators in the form of properly configured ribs. The use of ribs intensifies the heat transfer and at the same time increases not only the flow resistance but also the energy costs. Therefore, designing modern heat exchangers with optimal thermal and flow parameters requires the knowledge of the theory of heat exchangers as well as measurement methods and numerical calculations. Bearing in mind the above, the liquid crystal techniques (LCT), particle image velocimetry (PIV) and digital image processing (DIP) for temperature, velocity, friction factor and heat transfer coefficient measurements are presented herein. These three optical tools (using desktop computers) create an extremely powerful and advanced measuring technique that has not been available anywhere before. Brief histories of these measurement methods and techniques are discussed and some examples are presented. In order to assess and select the value of the measurement technique, local and average distributions of Nusselt numbers (in the measurement section) obtained by the transit analysis method on the inter-rib regions of a plate coated by thermochromics liquid crystal and heated by air as an alternative to the steady-state analysis. In the parallel, numerical calculation was performed with the use of the ANSYS Fluent software code and supported by laser anemometry-computed turbulence intensity of air flow. Comparison of the Nusselt number distributions was determined by three methods, i.e., steady state, the transient method and CFD simulation. Up to three-fold enhancement of the local heat transfer capability was observed. Failure to take into account the surface of the ribs in heat transfer causes differences in the obtained results of the Nusselt number depending on the method used. Apart from the heat transfer data, the pressure drop in the form of friction factors is also presented. On the basis of the conducted research, it can be stated that both qualitative and quantitative coherence was obtained between the experimental and computational studies.

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Forced convection enhancement in channels with transversal ribs and nanofluids

Andreozzi

Manca²,

Nardini³

et al. 2016

Applied Thermal Engineering

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Measurements of heat transfer enhanced by the use of transverse vortex generators

Cited by 10 publications

References 44 publications

The Use of Liquid Crystal Thermography in Selected Technical and Medical Applications—Recent Development

The Use of Liquid Crystal Thermography in Selected Technical and Medical Applications—Recent Development

Modeling of Passive and Forced Convection Heat Transfer in Channels with Rib Turbulators

Forced convection enhancement in channels with transversal ribs and nanofluids

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