Instability of the Rayleigh-Benard Convection for Inclined Lower Wall With Temperature Variation

Ayed, Sadoon; Ilić, Gradimir; Živković, Predrag; Vukić, Mića; Tomić, Mladen

doi:10.22190/fume1602179a

Cited by 2 publications

(3 citation statements)

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“…al., 2018); (Klein, M. & Schmidt, 2019)). Rayleigh also explained that convection occurs when the Rayleigh number (R) is greater than the critical Rayleigh number (Rc), with Rc = 1708 (Ayed, et. al., 2016), or has the order 10 3 (Aurnou, J.M.…”

Section: Observation Of the Speed Of Motion Of Water Particlesmentioning

confidence: 99%

“…The theoretical study of RBC using the numerical method was carried out using multiscale analysis and asymptotic expansion method (Fan, et. al., 2020) the 2D pseudo-spectral method in the MATLAB code for the Navier-Stokes equation (Ayed, et. al., 2016), a pseudospectral method based on Fourier (Ramos and Briozzo, 2015), the Lattice Boltzmann Simulation method (Nataraj, et.…”

Section: Introductionmentioning

confidence: 99%

“…where  is the coefficient of thermal expansion,  the coefficient of thermal diffusion,  the coefficient of kinematic viscosity, d the distance between two plates, g of gravitational acceleration, T of temperature difference and R is known as the Rayleigh number (Rayleigh Number). Rayleigh also explained that convection occurs when the Rayleigh number (R) is greater than the critical Rayleigh number (Rc), with Rc = 1708 (Ayed, et. al.…”

Section: Introductionmentioning

confidence: 99%

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Observation of Rayleigh Benard Convection as A Representation of Learning of Natural Phenomenons Through Water Molecular Movement

Rohman

Marwoto²,

Iswari³

et al. 2022

jppipa, pendidikan ipa, fisika, biologi, kimia

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Research has been carried out with a device to observe the phenomenon of Rayleigh Benard convection, made of a glass box bounded by a lower plate and an upper plate. The bottom plate is hotter than the top plate which functions to heat the horizontal fluid layer from below. This study aims to observe the phenomenon of water molecule movement. The observation medium was water mixed with teak sawdust as a representation of water particles with an average density of mean=0.99 g/cm3. The variation of water thickness (d) used 5 cm and 6 cm with variations in temperature difference (DT) with an average increase of 50°C. Data was collected with a cellphone camera and run with Windows Movie Maker software which has a time accuracy of up to 0.001 seconds. It was observed that an increase in the temperature difference (DT) between the two plates resulted in an increase in the velocity of motion of water particles in convection which is depicted by a v-DT diagram. Due to the difference in temperature (DT) also results in the movement patterns of water molecules, namely laminar and turbulent. The turbulent phase with the Rayleigh number value R~107, indicated that the flow of water particles is getting faster, the direction of the flow of the particles starts to become irregular and sometimes signs of a water vortex appear. At different fluid immersion results in the start of a turbulent phase. The turbulent phase for d=5cm is observed at DT~30°C, and d=6cm at DT~20°C. Furthermore, this RBC phenomenon is used as a representation of learning natural phenomena in air fluids, namely whirlwinds as an event due to differences in temperature and pressure of a fluid

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Section: Observation Of the Speed Of Motion Of Water Particlesmentioning

confidence: 99%