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High-Rayleigh-number turbulent convection has been studied using the technique of photon-correlation homodyne spectroscopy to measure velocity differences at various length scales. The measured intensity correlation function G (q, t, L) is found to be of the scaling form G (qu (L) t), with u (L) L^0. 6 being the characteristic turbulent velocity at the legth scale L and q the scattering vector. It is also found that the lower cutoff length l₂ of the scaling range obeys a power law l₂Ra^-0. 3. The measured power-law exponents are in excellent agreement with theoretical predictions.
Tong et al. (Mon,) studied this question.