Reynolds ridge

A very interesting controlled experiment was described by Mockros and Krone (1968). Ordinary tap water was recirculated in a flume 113 cm wide 8 cm deep and 4 m long. When a shallow obstruction was placed across the full width of the channel, a surface film was observed growing. The upstream front of the film was easily visible by a small ripple, the so-called Reynolds ridge (Harper and Dixon 1974). The growth followed a power law first at a fast rate, and then at a reduced rate (Figure 3). 

It was further found that the surface tension varies linearly along the film (excluding the front portion with the Reynolds ridge). Using (8) we get... 

Fig. 4. Drop in surface tension A a from a reference level behind the Reynolds ridge as a function of U2x where x is the distance behind the same reference level (taken from Mockros and Krone 1968)...

Fig. 3. Absolute hemicyanine monolayer concentrations just downstream of a Reynolds ridge in a laminar channel flow. The concentration gradient was determined using reflected SHG imaging...

Ardery, Z.L. and Reynolds, C.D., Carbon fiber thermal insulation. Y-12 Report 1803, Oak Ridge Y-12 Plant, Oak Ridge TN, 1972. 

Simulation of helical flows lor channel with oblique ridges - Reynolds number flow regime... 

M 76] [P 66] The relative transverse velocity depends only vaguely on the Reynolds number for oblique ridged channels [44], This is surprising at first sight, since the absolute transverse velocity within the oblique ridges is considerably enhanced in this way. 

The transitions observed at lower Reynolds numbers are due to the presence of roughness on the wall surface. In order to smdy the effect of roughness on transition to turbulence, a systematic experimental study was conducted by Kandlikar et al. [7]. A test fixture was developed with 10 mm-wide channels and an adjustable gap to allow for different channel sizes. The two side walls were removable, and different surface features could be machined on them. For smooth channels, the transition was noted to occur between Rej = 2,300 and Rej = 2,500. Different roughness features were introduced by machining ridges onto the walls. As the relative... 

REYNOLDS, S. A. Analytical Chemistry Division, Oak Ridge National Laboratory. Oak Ridge, Tennessee 37830 (I, 397]... 

After naphthalene (300 mg/kg i.p.) treatment of mice and epithelial repair, neuroepithelial bodies were significantly increased along the walls of the airways as well as on branch point ridges (Peake et al. 2000). Reynolds et al. (2000) provided the following evidence that the neuroepithelial body microenvironment serves as a source of airway progenitor cells that contribute for focal regeneration of the airway epithelium ... 

Whenever the Reynolds number is large, the equation of motion of a ridge is fundamentally altered. Consider the case of a one-dimensional ridge. The... 

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