The discussion revolves around determining the Reynolds number for a closed pipe that spins like a washing machine. Participants explore the appropriate characteristic length to use in this context and how it relates to the flow regime (laminar or turbulent). The conversation touches on theoretical considerations and practical implications of flow dynamics in unusual scenarios.
Participants do not reach a consensus on the best approach for determining the Reynolds number or the appropriate characteristic length. Multiple viewpoints are presented, and the discussion remains unresolved regarding the optimal method for these calculations.
Participants highlight the complexity of choosing a characteristic length based on the specific flow conditions and the physics involved, indicating that assumptions and definitions may vary based on the scenario being analyzed.
Depends. Agitator or Spin cycle? Whites, Permanent Press, or Delicates?fahraynk said:What would the reynolds number be for a closed pipe spinning like a washing machine? would the characteristic length be the diameter... if so why. Everything I have read is so vauge on this. How can I determine it for strange situations?
Can I skip it and figure out if flow is laminar or turbulent some other way?
Well, sort of like a couette flow with a outer and inner cylinder but just remove the inner cylinder...boneh3ad said:The diameter would be one length scale you could pick. It really depends on the physics you hope to study, though. Choosing the length scale for calculating the Reynolds number is all about choosing one that is appropriate to the physics you are trying to describe.