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Periodically modulated thermal convection

WebApr 29, 2024 · Here, we perform numerical simulations of Rayleigh-Bénard (RB) convection with time periodic modulation in the temperature boundary condition and report how this modulation can lead to a significant heat flux (Nusselt number ) enhancement. WebApr 1, 2024 · The team found that the modulation enhanced heat transfer efficiency by up to 20% over a wide range of frequencies. The researchers placed 12 temperature sensors …

Virtual Spectral Selectivity in a Modulated Thermal Infrared …

WebDec 28, 2012 · The heat transfer between the walls becomes dominated by conduction driven by a uniform vertical temperature gradient which decreases proportionally to the intensity of convection resulting in the average Nusselt number decreasing as α −3. It is shown that processes described above occur for Prandtl numbers 0.001 < Pr < 10 … WebOct 1, 2024 · This website requires cookies, and the limited processing of your personal data in order to function. By using the site you are agreeing to this as outlined in our … jazeera online account open https://tfcconstruction.net

Convective and Radiative Heat Transfer in Porous Media

WebJul 10, 2008 · One is the synchronization of the kicking period of energy input with the intrinsic time scale of the turbulent flow. When the repetition period of the input energy … WebTitle: Hexagons and rolls in periodically modulated Rayleigh-Benard convection Full Record Other RelatedResearch Abstract A laterally infinite liquid layer is heated from below in a … WebApr 1, 2024 · This instability is known as temperature-modulated RBC (henceforth referred to as TMRBC) and is found to appear as a convective rolls pattern, which oscillates either with the forcing frequency (harmonically) or with the half of the forcing frequency (subharmonically). low voltage led pagoda path lights

Thermal conduction, convection, and radiation - Khan Academy

Category:arXiv:2004.14104v1 [physics.flu-dyn] 29 Apr 2024

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Periodically modulated thermal convection

Periodically modulated thermal convection Papers With Code

WebJan 1, 2005 · Convection in modulated gravity and thermal gradients has been a subject of interest in the research community for the last several decades. Gershuni and Zhukhovitskii [1] were among the early investigators to study the instability of thermal convection driven by periodically varying parameters in idealized systems. WebDec 20, 2024 · Here, we focus on the temperature response to periodic modulation in IH convection. Figure 5 shows the typical instantaneous snapshots of temperature field …

Periodically modulated thermal convection

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WebThe Lorenz model is shown to reproduce, either exactly or to a good approximation, most previous theoretical results on modulated convection, and the model can be studied simply for a wide range of parameters. Thermal convection between horizontal plates is considered for a situation in which the driving force varies periodically in time. This variation may … WebJan 1, 1989 · These two equations are valid if Pe,&gt;&gt; 1, that is, when the longitudinal heat transfer is dominated by Convective and Radiative Heat Transfer in Porous Media 229 …

WebJun 24, 2024 · The need for affordable low-power devices has led MEMS-based thermal emitters to become an interesting option for optical gas sensors. Since these emitters have a low thermal mass, they can be easily modulated and combined with a lock-in amplifier for detection. In this paper, we show that the signal measured by a lock-in amplifier from a … WebApr 29, 2024 · Here, we perform numerical simulations of Rayleigh-Bénard (RB) convection with time periodic modulation in the temperature boundary condition and report how this …

WebMar 28, 2006 · Abstract The stability of a horizontal layer of fluid heated from below is examined when, in addition to a steady temperature difference between the walls of the layer, a time-dependent sinusoidal perturbation is applied to the wall temperatures. Only infinitesimal disturbances are considered. WebJan 10, 2024 · It is found that the introduction of an electric field is an effective way to achieve heat transfer enhancement. The heat flux is augmented more efficiently for a large Prandtl number and a low Rayleigh number, where the electric field has a strong effect relative to buoyancy.

WebPeriodically patterned sub-micron structures are widely used for functional surfaces, such as anti-reflective surface, self-cleaning surface, and selective emitters. ... Figure 2: …

WebSep 13, 2016 · Download PDF Abstract: In this paper, we present results from an experimental study into turbulent Rayleigh-Benard convection forced externally by periodically modulated unidirectional rotation rates. We find that the azimuthal rotation velocity $\dot{\theta}$(t) and thermal amplitude $\delta$(t) of the large-scale circulation … jazeera paints factoryWebNational convection heat transfer in liquids confined by two horizontal plates and heated from below. J. Heat Transfer 81, 24–28. Goldstein, S. (1937). The similarity theory of … low voltage led outdoor path lightsWebOct 9, 2024 · (a) Instantaneous temperature fields at different phases in one modulation period for Ra = 10 8, Pr = 4.3, f = 10 − 3. (b)–(d) Phase-averaged temperature profiles during one period for Ra = 10 8, Pr = 4.3 and different modulation frequencies, namely (b) without … low voltage led pathway lights