2016
DOI: 10.1016/j.applthermaleng.2016.04.105
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Spatio-temporal disruption of thermocline by successive laminar vortex pairs in a single tank thermal energy storage

Abstract: The stratification efficiency of single tank thermal energy storage is affected by the internal mixing processes, especially in the thermocline region due to disturbances of different kinds. To study the mixing dynamics at the interface, we have conducted detailed numerical and supporting experimental studies for different Atwood numbers (stratification levels). Numerical experiments were conducted with two successive vortex pairs with three different time-lags (short, medium and long). For the short time-lag … Show more

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Cited by 14 publications
(7 citation statements)
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“…The power density is largest at low frequencies that are less than the Brunt-Väisälä frequency. Similar behavior was observed in case of successive multi-vortex interaction (with different vortex generation mechanism) with thermocline [21]. The peak frequency values and the Brunt-Väisälä frequency values, tabulated in Table 3, increase with Atwood number.…”
Section: Thermocline Responsesupporting
confidence: 60%
“…The power density is largest at low frequencies that are less than the Brunt-Väisälä frequency. Similar behavior was observed in case of successive multi-vortex interaction (with different vortex generation mechanism) with thermocline [21]. The peak frequency values and the Brunt-Väisälä frequency values, tabulated in Table 3, increase with Atwood number.…”
Section: Thermocline Responsesupporting
confidence: 60%
“…Turbulent diffusivities could easily be one or two orders of magnitude higher than the molecular thermal diffusivity assumed here depending on the scale and intensity of turbulence. Thus turbulence has the potential to significantly degrade the effectiveness of a liquid thermocline, and many complex studies of this have been carried out for example by Tinaikar et al [4].…”
Section: Resultsmentioning
confidence: 99%
“…In this case the thermal storage media can also act as the heat exchange fluid transferring heat directly with the Wind-TP thermal pumping circuit. However it is important to avoid perturbing the delicate thermocline [4] by adding turbulence or non-uniform momentum at the inlet as this can be a source of significant exergy destruction. Fig.…”
Section: Liquid Thermoclinementioning
confidence: 99%
“…Matulka et al [16] used the number to quantify the initial state of a stratified tank before the inclusion of entrainment. Tinaikar et al [17] used the Atwood number in a model to include successive laminar vortex pairs in which the Atwood number described the stratification strength. The Atwood number includes less information than the Archimedes and is simpler to calculate.…”
Section: Literature Overviewmentioning
confidence: 99%