Draught tube

(Water Wheels) an air-tight pipe extending downward into the tailrace from a turbine wheel located above it, to make the whole fall available; - called also draught box.

See also: Draught

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The technology works in four steps: Insert a DraughtKeg into BeerTender, connect the included disposable draught tube, close the lid and serve.
Kawabata, "Liquid Circulation in Bubble Column with Draught Tube," J.
At an inquest held in Nuneaton yesterday, Warwickshire coroner Michael Coker was told that a debris basket had to be lowered down the side of the structure to reach 45-year-old James Johnson, who was lying unconscious at the bottom of a draught tube.
Mr Johnson had fallen to the bottom of the draught tube.
The detailed flow structures in bubble columns with and without internal draught tube have been investigated using the PIV technique.
The liquid velocity distribution in terms of flow pattern and Reynolds stresses in bubble column with and without draught tube using multiple orifices are addressed and liquid phase viscosity and solid particle effects on transition regime described.
The present study proposes to examine the full field measurement of Reynolds shear stress and normal stresses at the wall region in 2D bubble column with and without draught tube through the use of a PIV system.
Furthermore, the flow structure in the absence or presence of draught tube system is extended in this present work where the liquid velocities are generally higher than in bubble columns (Wild et al.
1999) identified three flow regimes in internal draught tube bubble columns, namely, (regime I) no air bubbles (when liquid velocity in the downcomer is lower than slip velocity of bubbles in the liquid) (regime II) bubbles remain stationary (when liquid velocity in the downcomer is equal to the slip velocity of bubbles in the liquid) and (regime III) bubbles flow downwards and into the riser (when liquid velocity in the downcomer is higher than slip velocity of bubbles in the liquid).
30 image pairs were recorded near the wall when the gas was introduced at critical value of superficial gas velocity for transition in each bubble column with and without draught tube.
An inquest in Nuneaton yesterday was told that a debris basket had to be lowered down to reach 45-year-old James Johnson, who was lying unconscious at the bottom of a draught tube.