We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
ON SIEVING AND SETTLING TECHNIQUES FOR SAND ANALYSIS.
- Authors
Sengupta, Supriya; Veenstra, Hemmo J.
- Abstract
The basic differences between mechanical analysis of sand by Ro-Tap sieving and by settling in a sedimentation balance are discussed. The Groningen balance can continuously and rapidly and record settling times of the grains (50-1,000 µ) of a 1.5-g sample with a maximum recording and reading error of about 2%. The theory of sieving is not fully development yet, nor has the theory of settling of sand-sized particles been adequately expressed by any mathematical law. The drag coefficient (Cd) and Reynolds number (Re) relation often used to derive diameter (d) from settling velocity (v) in this size range, are calculated from experimental data on diameter and velocity. Conversion of Settling times to "sedimentation diameters" with the help of experimental curves for single, spherical quartz grains and comparison with the corresponding "sieve diameters" are often found to be unsatisfactory in the case of natural sands, because shape and density variations of every individual grain in a sample can never taken into account. Therefore, the use of settling velocity as a grain parameter is advocated.
- Subjects
SOIL testing; SAND; SEPARATION (Technology); MACHINE separators; SEDIMENTATION &; deposition; REYNOLDS number; QUARTZ crystals
- Publication
Sedimentology, 1968, Vol 11, Issue 1/2, p83
- ISSN
0037-0746
- Publication type
Article
- DOI
10.1111/j.1365-3091.1968.tb00842.x