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More services...Simulation of Heat and Momentum Flow in a Quartz Mercury-filled HID Lamp in Vertical Operation
Dreeben, T.
OSRAM SYLVANIA
FEMLAB is used to provide a benchmark simulation for a classical problem in high-intensity discharge lighting: the pure mercury-filled quartz HID (high-intensity discharge) lamp.
A steady 2-dimensional axi-symmetric formulation estimates the operating temperatures, electrical potential, and gas velocities for an HID lamp running in vertical orientation. Governing equations and their approximations are described: These include the compressible continuity equation, the Elenbaas-Heller (heat balance) equation, the current continuity equation for electrical potential, and momentum equations in the radial and vertical directions. The model provides estimates of the temperature profiles in the gas and in the arc tube, electrical potential in the gas, and buoyancy-driven velocity in the gas. Results give us a wealth of baseline information on a working HID lamp.
