Importance

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Abstract

The disclosed methods and apparatus for mixing a secondary fluid with a primary fluid have utility in venturi and other fluid mixing systems in agriculture, fluid, fuel combustion and other fields where liquid or gaseous chemicals, liquid or gaseous fuels or other fluids are entrained in a stream of water, air or other gaseous or liquid primary fluid. One of these methods provides for the primary fluid (21) a first flow channel (65) deceasing in a direction of flow of primary fluid, utilizes dynamic energy of that primary fluid to induce secondary fluid (35) into that primary fluid, and provides for the primary fluid with induced secondary fluid a second flow channel (66) increasing in a direction of flow of that primary fluid with induced secondary fluid, while arranging corresponding sides 67 and 68 of these first and second flow channels along a plane common to said first and second channels. Another method or apparatus that may be combined with the method or apparatus just described, or that may be employed separately, tracks the primary fluid in pressure with the secondary fluid at a negative pressure offset relative to a pressure that would produce a substantially constant ratio of secondary fluid to primary fluid (94, FIG. 3), meters that secondary fluid (101), and distributes such metered secondary fluid across a flow of the primary fluid (79, 92). Methods and apparatus providing a gas-fired heater (10) tilt a combustion chamber (23) and heat exchanger assembly (14) relative to ground so that substantially all condensate and scale (19) falling from the heat exchanger misses the gas burner (16).

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First Claim