Nwebie,formula for drag of submerged object

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    Drag Submerged
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SUMMARY

The discussion focuses on calculating the drag force and ascent time of a submerged styrofoam rectangle measuring 100 cm in height, 15 cm in length, and 50 cm in width, submerged at a depth of 20 meters. The drag force is influenced by the object's surface area (750 cm²) and geometry, which can vary with depth. While Bernoulli's equation can be used to define buoyancy, the drag calculation is complex and requires experimentation for accurate results. The smooth surface of the styrofoam, coated with fiberglass, is noted as a significant factor in the drag calculation.

PREREQUISITES
  • Understanding of fluid dynamics principles, particularly drag force.
  • Familiarity with Bernoulli's equation and buoyancy concepts.
  • Knowledge of the geometry of submerged objects.
  • Basic experimental design for validating theoretical calculations.
NEXT STEPS
  • Research the drag coefficient for various shapes in fluid dynamics.
  • Learn how to apply Bernoulli's equation to calculate buoyancy force.
  • Explore experimental methods for measuring drag force on submerged objects.
  • Investigate the effects of surface texture on drag in fluid dynamics.
USEFUL FOR

This discussion is beneficial for students and professionals in physics, engineering, and marine science, particularly those interested in fluid dynamics and the behavior of submerged objects.

alibaba2
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hi, newbie needs a little help...what is the formula and could someone please take the time to explain in detail how to compute the elements in the formula for the following task.

a submerged styrofoam rectangle with size H 100cm x L 15cm x W 50 cm. the object is submerged at 20 meters (60ft) underwater. it will be rising upward with the top side (750cm^2 area )
based on formula for drag, i need to calculate how long it will take to surface at the top, and what is its speed.

big thank you in advance...
 
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There really no hand calculation for this. You can define buoyancy force using Bernoulli's equation however the drag is rather difficult. It relies on the surface and geometry of the block which can change significantly depending on the depth its rising from. My suggestion is just to guesstimate with experimenting.
 
surface of the rectangular block is styrofoam, coated with thin fibreglass film, so it is 100% smooth. shape is defined in the initial text.
10x
 

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