Question
Rarefaction effects occur only when this quantity is large. For 10 points each:
[10m] Name this quantity that is between 0.1 and ten for transitional flow, and greater than ten for free molecular flow. Second-order expansion of the Boltzmann equation in this parameter gives the ill-posed Burnett equations.
ANSWER: Knudsen (“k’NOOD-sen”) number [accept answers that do not pronounce the “K” in “Knudsen”; prompt on Kn or epsilon]
[10h] Transitional flow can be modeled by the Burnett equation or by a 13-moment equation named for this physicist that is derived via expansion of the Boltzmann equation in Hermite polynomials. With a Soviet, this physicist names a two-dimensional equilibrium equation in ideal MHD.
ANSWER: Harold Grad [accept Grad 13-moment equation or Grad 20-moment equation; accept Grad–Shafranov equation or Grad–Shafranov operator]
[10e] A flow regime named for this behavior occurs at Knudsen numbers between 0.001 and 0.1. At lower Knudsen numbers, a fluid at a boundary is static relative to the boundary, so the “no-[this behavior]” condition applies.
ANSWER: slipping [accept no-slip condition]
<Arya Karthik, Physics>
Summary
| 2023 Chicago Open | 08/05/2023 | Y | 9 | 11.11 | 100% | 11% | 0% |
Data
| BHSU | [moderator voice] yes that is so tenpointscore! is your team feeling bonuspilled? | 0 | 0 | 10 | 10 |
| In Search of Things Past | Hang et al., Robert Browning | 0 | 0 | 10 | 10 |
| I prefer really not to speak. If I speak I’m in big trouble | Don't be Afraid, the Clown's Afraid Too | 0 | 0 | 10 | 10 |
| Romanos IV Diogenes’ Macaroni Grill | The Plague (anime)" was redirected to: "Oran High School Host Club | 0 | 0 | 10 | 10 |
| Evans Hall destruction awaiters | Saint Peter Andre 3000 | 0 | 0 | 10 | 10 |
| Team Name Think Detail | I would prefer not to | 10 | 0 | 10 | 20 |
| Curse you, Periplus the Platypus! | The anti-STOON-dahl cabal (the tall Keyal et al.) | 0 | 0 | 10 | 10 |
| Quasicrystal Silence | The Catastrophic Implosion of Packet Sub | 0 | 0 | 10 | 10 |
| Teach Us to Outgrow Our Ladness | wave2: trimming membership codes 9655377758gp | 0 | 0 | 10 | 10 |