The performance enhancement criterion combining heat transfer and pressure drop shows significant improvement over steady flow case as well as for one-way twisted tube. The Nusselt number data shows significant enhancement for the sinusoidal inlet velocity as compared to that of the steady case, i.e. To solve the governing equations, a finite volume based method was utilized. Both the pulsation amplitude and Strouhal number are varied during the course of this study. The thermal performance parameter of the proposed novel geometry was assessed within a Reynolds number range of 1–100. The inlet pulsation follows sinusoidal pattern in time. The novel geometry promotes mixing of fluid layers leading to transport augmentation. The first half portion of the channel is twisted clockwise, whereas the twist in the remaining part is having counterclockwise twist. The channel with square cross section is wavy in nature as well as twisted. However, the argument has so far been restricted to cases of steady flow. Is it possible to unmix colors This short video shows how Demonstrate laminar flow to your physics class by setting up one beaker inside another and filling the space between them with a viscous liquid such as corn syrup. The current work examines unsteady, laminar flow heat transfer inside a novel twisted sinusoidal wavy microchannel. fluid mechanics - Fluid mechanics - Viscosity, Flow, Dynamics: As shown above, a number of phenomena of considerable physical interest can be discussed using little more than the law of conservation of energy, as expressed by Bernoulli’s law. This Twist in Time - Laminar Flow Instructional Video is suitable for 7th - 12th Grade. These devices pile up large amount of heat accompanied by smaller surface area to release it. Heat transfer performance of microchannel are becoming an important area of research with the current fast growing scenario of high speed computing and miniaturized electronic devices. We shall concentrate on laminar flow for the remainder of this section, leaving certain aspects of turbulence for later sections.Suvanjan Bhattacharyya 1 *, Sampad Gobinda Das 2 and Himadri Chattopadhyay 2Ĭenter for Renewable Energy and Environment Development, Department of Mechanical Engineering, Birla Institute of Technology and Science, Pilani, Pilani Campus, VidyaVihar, Rajasthan 333 031, Indiaĭepartment of Mechanical Engineering, Jadavpur University, Kolkata 700 032, West Bengal, India The drag both between adjacent layers of fluid and between the fluid and its surroundings forms swirls and eddies, if the speed is great enough. First, any obstruction or sharp corner, such as in a faucet, creates turbulence by imparting velocities perpendicular to the flow. Streamlines are smooth and continuous when flow is laminar, but break up and mix when flow is turbulent. The lines that are shown in many illustrations are the paths followed by small volumes of fluids. When there is turbulence, the layers mix, and there are significant velocities in directions other than the overall direction of flow. The fluid in contact with the horizontal surface is stationary, but all the other layers slide over each other. Laminar flow over a horizontal surface may be thought of as consisting of thin layers, or laminae, all parallel to each other. Layers flow without mixing when flow is laminar. In laminar flow, the velocity, pressure, and other flow properties at each point in the fluid remain constant. (credit: Creativity103)įigure shows schematically how laminar and turbulent flow differ. If you watch the smoke (being careful not to breathe on it), you will notice that it rises more rapidly when flowing smoothly than after it becomes turbulent, implying that turbulence poses more resistance to flow. The smooth flow is called laminar flow, whereas the swirls and eddies typify turbulent flow. \): Smoke rises smoothly for a while and then begins to form swirls and eddies.
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