Turbulent convective transfer in plate heat exchangers

✍ Scribed by W.W Focke

• Publisher: Elsevier Science
• Year: 1983
• Tongue: English
• Weight: 345 KB
• Volume: 10
• Category: Article
• ISSN: 0735-1933
• DOI: 10.1016/0735-1933(83)90005-2

✦ Synopsis

Readily available data on turbulent transfer in plate heat exchangers can be correlated by a heat transfer-energy dissipation analogy: N~ 3 e g,~Pr,Vi) = C 3(fRe ) in which the Nusselt number modified for changes in the Prandtl number and bulk to wall viscosity ratio Vi is related to the friction factor f and the Reynolds number.

The exponent e is a weak function of the coefficient C 3 which depends on the corrugation geometry.

When using chevron or herringbone type patterns the heat transfer depends significantly on the angle between the plate corrugation and the main flow direction.

If this angle is 7/4 the heat transfer per unit of mechanical energy dissipated is a maximum.

Although maximum transfer (with maximum pressure drop) is obtained at ~/2, a more practical angle giving high transfer at moderate pressure drops is 27/5.