✦ LIBER ✦

RTD for diffusion free laminar flow in helical coils

✍ Scribed by R.N. Trivedi; K. Vasudeva

Publisher: Elsevier Science
Year: 1974
Tongue: English
Weight: 349 KB
Volume: 29
Category: Article
ISSN: 0009-2509
DOI: 10.1016/0009-2509(74)80005-9

No coin nor oath required. For personal study only.

✦ Synopsis

The results of an experimental investigation of the RTD in the low Reynolds number, low Dean number region for helical coils are reported.

It is found that, under the conditions of negligible molecular diffusion, for 0.6 < N, < 6 and curvature ratio from 0.0036 to 0.0970 coiling results in an essentially unique RTD which is narrower than that for straight tubes confirming the validity of a published theoretical analysis.

The results throw light on the conditions for the validity of Dean's analysis.

An empirical expression is obtained for taking into account the weak influence of curvature ratio on narrowing the RTD.

📜 SIMILAR VOLUMES

On RTD for laminar flow in helical coils

✍ A.K. Saxena; K.D.P. Nigam 📂 Article 📅 1979 🏛 Elsevier Science 🌐 English ⚖ 183 KB

Shorter Commumcatlons 425 the effect of these unstable flow condltlons If, however, one neglects the above conslderatlons, it IS qmte reasonable to attnbute the decrease of the transfer coefficlent to the fact that a umform film flow IS approached as TOP or BOTTOM width increases, and the mass trans

Axial dispersion in laminar flow in heli

Axial dispersion in laminar flow in helical coils

✍ R.N. Trivedi; K. Vasudeva 📂 Article 📅 1975 🏛 Elsevier Science 🌐 English ⚖ 784 KB

The results of an experimental study of dispersion of solute in helical coils under laminar flow conditions are reported. The ranges of variables covered are 10 < h < 280, lo< NRI < 1600 and 1.5 X 1@ < Ns. < 8.7 x lo'. Under the conditions where the dispersion model holds the data are correlated wit

The residence time distribution for lami

The residence time distribution for laminar flow in helically coiled tubes

✍ E.B. Nauman 📂 Article 📅 1977 🏛 Elsevier Science 🌐 English ⚖ 693 KB

Suable errors exmt III prevtously pubhshed studies on the residence tune dmtnbmon for ideal lammar flow 111 a hehally coded tube The numencd methods used to gwe corrected results are generally useful for Bow situations where the projections of the strcamhnes on the ctmnacl cross-sectw3n are closed c

Numerical treatment of fully developed l

Numerical treatment of fully developed laminar flow in helically coiled tubes

✍ L. C. Truesdell Jr.; R. J. Adler 📂 Article 📅 1970 🏛 American Institute of Chemical Engineers 🌐 English ⚖ 611 KB

## Abstract Laminar flow in helically coiled tubes is treated numerically. Fully developed axial and secondary velocities are calculated for both circular and elliptical cross sections. Only closely wrapped helices, that is, helices with modest pitch, are considered. Ten solutions with Deans number

Numerical treatment of laminar flow in h

Numerical treatment of laminar flow in helically coiled tubes of square cross section. Part I. Stationary helically coiled tubes

✍ B. Joseph; E. P. Smith; R. J. Adler 📂 Article 📅 1975 🏛 American Institute of Chemical Engineers 🌐 English ⚖ 890 KB

## Abstract Numerical solution of steady laminar flow in helically coiled tubes of square cross section for Dean numbers from 0.8 to 307.8 reveal two regimes of secondary flow. Up to Dean number of 100, the expected secondary flow pattern appears with twin counterrotating vortices. Above Dean numbe

Numerical treatment of laminar flow in h

Numerical treatment of laminar flow in helically coiled tubes of square cross section. Part II. Oscillating helically coiled tubes

✍ B. Joseph; R. J. Adler 📂 Article 📅 1975 🏛 American Institute of Chemical Engineers 🌐 English ⚖ 584 KB

## Abstract The numerical method of Part I is extended to study periodic laminar flow in helically coiled tubes of square cross section oscillating sinusoidally about their helix axis. Depending on the relative strength of the wall velocity and the velocity of flow through the tube, one of three fl