Thoma number

The Thoma number ( Symbol : , often ) (by: Dieter Thoma 1881-1942) is a dimensionless parameter of fluid mechanics . It describes the cavitation behavior of incompressible flows . ${\displaystyle {\mathit {Th}}}$ ${\displaystyle \sigma }$

${\displaystyle {\mathit {Th}}={\frac {y_{HA}}{y_{t}}}}$

With

• the specific holding energy ${\displaystyle y_{HA}}$
• the specific nozzle work . ${\displaystyle y_{t}}$

Individual evidence

1. ^ Herbert Sigloch: Fluid machines : Fundamentals and applications. Hanser Verlag, Munich / Vienna, 2006, pp. 138–139.