Van Holde-Baldwin Low-Speed Method

2 Van Holde-Baldwin (Low-Speed) Method (Rotor Velocity 10,000-14,000 rpm) 

Multiplying both sides by the factor cdr and integrating from the limit m (the meniscus) to the limit b (the bottom), we have 

Both terms (cb — Cm) /cq and can be experimentally determined using either 

Schlieren optics or the Rayleigh interference system. Here, we illustrate with the Rayleigh interference system. 

we run a synthetic boundary experiment to determine cq. The following drawing is an example  

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