Flotherm 教程 Cooling TechniquesFans and Heat Sinks.ppt

FLOTHERM V4.1 Introductory Training Course FLOTHERM/L/05/03 V4.1 Issue 1.0 Lecture 6A Cooling Techniques: Fans and Heat Sinks Reducing Temperatures Problem : We have a component that is too hot We can reduce the component temperature by increasing the heat transfer away it. We can: Add a fan Add a heat sink How do we add a fan? Drag and drop from Library Manager Fan SmartPart Fan Options Fan Options Modelling Levels Fan Flow Specification Fan SmartPart: Non-linear Fans Operating pressure shown on the fan curve Local minima ignored on fan curve .CSV import to create the fan curve points Or manually define the curve point by point. Fan SmartPart: Swirl Fan SmartPart: Model Options Fan SmartPart: Modeling Advice Use 3D, 4 facets for most applications Include swirl when critical components are close to fans Include swirl when fans are operating at high pressure Always check the fan operating point on the fan curve Fan SmartPart: Tables Window Fan Gridding Use of Localized grid is important when using the more detailed modeling levels Compact Heat Sink Model Volumetric resistance replaces fins Volumetric source adds heat Saves grid Good system level data obtained Manual Compact Heat Sink Model Volumetric resistance replaces fins Volumetric Surface Exchange attribute controls heat transfer (.CSV import) Results Animations Particle Animations Numerical Smoke Test Plot Animations Animating a Visualization Plane Animating an Iso-Surface Particle Animations Position with ‘Snap Target’, and Manipulator tools Snap Target to position particle source approximately Translate, Rotate, and Scale to refine the position precisely Control the appearance of the particles Number of Particles, Life-time, time-step control where the particles are displayed Smear, width, energy, particle type and others control the appearance of the particles Particle Animations Plot Animations Use the VCR controls to animate a selected Visualization Plance or Iso-Surface plot Use An