Topic
Pipe flow
About: Pipe flow is a research topic. Over the lifetime, 13826 publications have been published within this topic receiving 351605 citations.
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TL;DR: In this article, the Poiseuille flow of a yield stress fluid in a square section is modeled and the dead regions in outer corners and the plug region in the center are exhibited.
117 citations
TL;DR: In this paper, the authors used nonlinear and standard k-ɛ turbulence models to predict the Reynolds stresses in the core flow region immediately above the ribs and the local Nusselt numbers were underpredicted.
117 citations
TL;DR: In this article, two distinct mass-transfer regimes, associated with energy-containing and energy-dissipating turbulent motions, are identified, and a criterion, based on the turbulence Reynolds number, is determined for the applicability of each regime.
117 citations
TL;DR: In this paper, a plane fin heat sink with duct and impinging flow was used to determine the minimum convection resistance of a typical 60 mm fan, within specific fan and heat sink space limits.
Abstract: Current desktop computers typically use fan-heat sinks for cooling the CPU, referred to as active heat sinks. This work seeks to determine the heat rejection limits for such fan-heat sinks, within specific fan and heat sink space limits. A fixed volume, 80 /spl times/ 60 /spl times/ 50 mm is chosen as the limiting dimensions, which includes the fan volume. The present work addresses plane fin heat sinks, on which a typical 60 mm fan is mounted. Both duct flow and impinging flow are considered. Analytically based models are used to predict the optimum geometry (minimum convection resistance) for plane fins with duct and impinging flow configurations. Also assessed are the effects of increased fan speed (up to 25%) and heat sink base size (33% increase) on air-cooling limits in duct and impinging flow. Tests on fan-heat sinks are done to validate the predictions. Optimization is also done for an enhanced (offset-strip) fin geometry in duct flow. The plane fin is found to outperform the enhanced geometry.
117 citations
TL;DR: In this article, the authors present a numerical investigation of instability in non-Newtonian flows through a sudden expansion, which is manifested by a symmetry breaking of the flow separation and the onset of the instability depends on the specific parameters involved in each model's constitutive equation.
Abstract: The paper presents a numerical investigation of instabilities occurring in non-Newtonian flows through a sudden expansion. Three non-Newtonian models, used in the literature for simulating the rheological behaviour of blood, are employed, namely the Casson, Power-Law, and Quemada models. The computations reveal that similar to Newtonian flow through a suddenly expanded channel, an instability also occurs in non-Newtonian flows. The instability is manifested by a symmetry breaking of the flow separation. The onset of the instability depends on the specific parameters involved in each model’s constitutive equation. The investigation encompasses a parametric study for each model, specifically the critical values at which transition from stable to unstable flow occurs. Due to the fact that for each of the Casson and Quemada models, two characteristic flow parameters exist, the relation between the critical values for each of these parameters is also examined.
116 citations