X-673-64-1F REV 001 DEC. â94 GODDARD SPACE FLIGHT CENTER, Greenbelt, Maryland 58 ENGINEERING DRAWING STANDARDS MANUAL The following note shall be added to the tooling drawing: THIS TOOLING IS USED TO FABRICATE PIECE PART GX-XXXXXXX.
The transfer of heat by the movement of a heated fluid is called convection. Fluids include liquids and gases. During convection, heated particles of a fluid begin to. flow, transferring heat energy from one part of the fluid to another.
A hot, less-dense lower boundary layer sends plumes of hot material upwards, and likewise, cold material from the top moves downwards. Convection is the heat transfer due to bulk movement of molecules within fluids such as gases and liquids, including molten rock (rheid). Convection takes place through advection, diffusion or both. Convection cannot take place in most solids because neither bulk current flows nor significant diffusion of matter can take place. Diffusion of heat takes place in rigid solids, but that is called heat conduction. Convection, however, can take place in soft solids or mixtures where solid particles can move past each other.