Shell balance in spherical coordinates

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SUMMARY

The discussion focuses on deriving the equation of continuity in spherical coordinates using shell balance. The key point is the origin of the sin(theta) term, which arises from projecting onto the x,y-plane from a zenith angle relative to the z-axis, rather than the azimuthal angle that revolves around the x,y-plane. The participants emphasize the importance of understanding these angular projections without converting to Cartesian coordinates.

PREREQUISITES
  • Spherical coordinates and their properties
  • Understanding of the equation of continuity
  • Basic principles of shell balance in fluid dynamics
  • Familiarity with angular projections in three-dimensional space
NEXT STEPS
  • Study the derivation of the equation of continuity in spherical coordinates
  • Explore the mathematical implications of angular projections in fluid dynamics
  • Review shell balance techniques in various coordinate systems
  • Investigate the relationship between zenith and azimuthal angles in spherical coordinates
USEFUL FOR

Students and professionals in fluid dynamics, physicists, and engineers who are working with spherical coordinate systems and need to understand the implications of angular projections in their calculations.

natanreal
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I want to derive equation of continuity in spherical coordiantes based on shell balance,can anybody tell me where the hell this sin(theta) comes from?
i don't want to transform from cartesian,
 
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