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022			_a0017-9310
100			_aP.Y. Chang. _9880156
100			_aW. Shyy. _9849883
100			_aJ.T. Dakin _9880157
245			_aA study of Three-Dimensional Natural Convection in High-Pressure Mercury Lamps—I. Parametric Variations with Horizontal Mounting
300			_a483-493 p.
520			_aA three-dimensional numerical model utilizing curvilinear coordinates and an efficient solution method has been used to investigate natural convection in horizontal, high-pressure mercury-vapor arctubes. For horizontal arcs, convection velocities are predominantly transverse to the arc axis. The associated upward bowing of the arc column results in non-uniform heating of the quartz wall which can substantially degrade the performance of the modern horizontal metal halide lamp. This investigation shows how the design parameters of the arctube, such as the mercury pressure, the curvature of the curved arctube, the offset electrode distance, and the electrode insertion length affect the temperature distribution in the arctube. Qualitatively, a downward curved arctube can move the hot arc core downward, and offset electrodes can improve temperatures near the ends of the arctube. The evolution of the design improvement of a 400 W high-pressure mercury lamp with the aim of centering the arc and having isotherms conform to the wall is achieved through better quantitative understanding of the transport characteristics.
650			_aThree-Dimensional Natural Convection _9879631
650			_aHigh-Pressure Mercury Lamps _9880158
650			_aParametric Variations _9880159
650			_aHorizontal Mounting _9880160
773	0		_dNew York, U.S.A : Pergamon Subsidiary of Elsevier Science & Technology _tInternational Journal of Heat and Mass Transfer _x00179310
856			_uhttps://www.sciencedirect.com/science/article/pii/001793109090183U
942			_2ddc _n0 _cART _o14993 _pMr. Muhammad Rafique Al Haj Rajab Ali (Late)
999			_c814782 _d814782