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Buoyancy problems due to weight of tools—Inability to achieve neutral buoyancy for ascent and positive buoyancy on surface. Increased risk of drowning. difficulty in controlling ascent rate. Risk of losing tools if they must be abandoned. Carrying an excessive weight of tools. Tools may be lifted and lowered to the worksite using a rope. [68]
Underwater divers are a common example of the problem of unstable buoyancy due to compressibility. The diver typically wears an exposure suit which relies on gas-filled spaces for insulation, and may also wear a buoyancy compensator, which is a variable volume buoyancy bag which is inflated to increase buoyancy and deflated to decrease buoyancy ...
In the ANZ survey, 52% of the fatalities had buoyancy problems. Most of these were due to inadequate buoyancy, but 8% had excessive buoyancy. In the DAN survey buoyancy problems were the most common trigger event leading to death. Buoyancy changes associated with wetsuits were found to be a significant factor. Based on a formula for approximate ...
An example of a non-Boussinesq flow is bubbles rising in water. The behaviour of air bubbles rising in water is very different from the behaviour of water falling in air: in the former case rising bubbles tend to form hemispherical shells, while water falling in air splits into raindrops (at small length scales surface tension enters the ...
Using slope of the linear regression line through data points, it is concluded that increase in the value of Grashof number or any buoyancy related parameter implies an increase in the wall temperature and this makes the bond(s) between the fluid to become weaker, strength of the internal friction to decrease, the gravity to becomes stronger ...
Neutral buoyancy occurs when an object's average density is equal to the density of the fluid in which it is immersed, resulting in the buoyant force balancing the force of gravity that would otherwise cause the object to sink (if the body's density is greater than the density of the fluid in which it is immersed) or rise (if it is less). An ...
The relative effect of buoyancy on mixed convection can be expressed through the Richardson number: R i = G r R e 2 {\displaystyle \mathrm {Ri} ={\frac {\mathrm {Gr} }{\mathrm {Re} ^{2}}}} The respective length scales for each dimensionless number must be chosen depending on the problem, e.g. a vertical length for the Grashof number and a ...
The stack effect or chimney effect is the movement of air into and out of buildings through unsealed openings, chimneys, flue-gas stacks, or other purposefully designed openings or containers, resulting from air buoyancy. Buoyancy occurs due to a difference in indoor-to-outdoor air density resulting from temperature and moisture differences ...