PPT-Convection & Buoyant Force

By Ross Nuechterlein Convection Convection  is the movement of molecules within fluids and is one of the major modes of heat and mass transfer in liquids and gas Buoyancy Buoyancy  is an upward acting force exerted by a fluid that opposes an objects weight. LESSON 2. Buoyant Forces and Liquid. Buoyant Force is an upward force which acts on an object that is being completely or partially immersed in a fluid. Example. Archimedes’ Principle. It states that for a body completely or partially immersed in a fluid, the upward buoyant force acting on the body is equal to the weight of the fluid it displaces.. Contents:. How to calculate. Whiteboards. Buoyant force is the weight of displaced water:. ρ. f. = Density of fluid in kg m. -3. V. f. = Volume of displace fluid in m. 3. g . = . 9.81 N kg. -1. Buoyant Force. Buoyant force is the upward force that fluids exert on all matter. . A great example is how a rubber duck floats in a bath tub. . Buoyant Force is Caused by Differences in Fluid Pressure. For a constant property, laminar flow a . similarity solution. exists for the flow field . u. (. y. ). local boundary layer thickness. local skin friction coefficient. average skin friction coefficient. Alison Stirling . 21. st. September 2015. Contents. Verification measures for forecasts (Michael Whitall). Representing convection-wave interactions (some background). Verification measures for forecasts. Physics. February 22/23. Will It Float?. Read section 19.4 and 19.5. Also, consider what we have already studied. See if you can list the reasons why an object will float. An object floats if:. Buoyant force larger than downward force of weight. . Convection Heat Transfer . Why is it windy at the seaside?. Cold air sinks. Where is the freezer compartment put in a fridge?. Freezer compartment. It is put at the top, because cool air sinks, so it cools the food on the way down.. Free Convection (or Natural Convection). fluid motion . induced by . buoyancy forces. buoyancy forces . arise when there are . density gradients . in a fluid and a . body force. . proportional to density arises . Q6) . Liquid pressure is determined by . density. and . depth. . An object submerged in water will experience a force in . all. areas of the surface due to liquid pressure.. The force on the sides cancel out. The force on the bottom is greater than the top. The . Pressure. What affects the pressure of a liquid?. Gravity. The density of the liquid . The depth of the liquid. Pressure. Remember when I told you that pressure increased when you went farther down in the water… Well how does pressure relate to depth if pressure is force divided by area…. 11.2 . Floating and Sinking. Buoyancy= the ability to float. buoyant force . – acts in a direction opposite gravity so it makes an object feel lighter. . O. k. . Let’s make sure we understand what is going on. . Keller and . Tackley. , 2009, Towards self-consistent modeling of the . martian. dichotomy: The influence of one-ridge convection on crustal thickness distribution, Icarus 202, 429-443. . The . dominant feature of the crustal thickness distribution obtained from one-ridge convection in the mantle is a characteristic, roughly elliptical shape that shows a striking first- order similarity to the shape of the . Conduction Convection . Radiation. Types of Heat transfer. Heat Transfer. Heat can be transferred in 3 ways. Conduction. Convection. Radiation. Heat flow depends on the temperature difference – . flows from hot to cold. Why is it windy at the seaside?. Cold air sinks. Where is the freezer compartment put in a fridge?. Freezer compartment. It is put at the top, because cool air sinks, so it cools the food on the way down..