Characterization of surface roughness effects on pressure drop in single-phase flow in minichannels

By Satish G. Kandlikar, Derek J. Schmitt, A. Carrano, J. B. Taylor. 2005

360 citations recorded by the source corpus.

Roughness features on the walls of a channel wall affect the pressure drop of a fluid flowing through that channel. This roughness effect can be described by (i) flow area constriction and (ii) increase in the wall shear stress. Replotting the Moody’s friction factor chart with the constricted flow diameter results in a simplified plot and yields a single asymptotic value of friction factor for relative roughness values of e∕D>0.03 in the fully developed turbulent region. After reviewing the literature, three new roughness parameters are proposed (maximum profile peak height Rp, mean spacing of profile irregularities RSm, and floor distance to mean line Fp). Three additional parameters are presented to consider the localized hydraulic diameter variation (maximum, minimum, and average) in future work. The roughness e is then defined as Rp+Fp. This definition yields the same value of roughness as obtained from the sand-grain roughness [H. Darcy, Recherches Experimentales Relatives au Mouvement de L’Eau dans...

Subfields: Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/bf8db9f693d897eee41e4bbd8e69b19abb07baef

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In Mechanical Engineering

Citations in the corpus

Numerical and experimental evaluation of a conformally cooled H13 steel injection mould manufactured with selective laser melting (2017, background): “The friction factor for turbulent flow can be obtained from a Moody diagram [59] which relates the Reynolds number (Re) to fD, through relative pipe roughness, r 1⁄4 ε D, where ε is a roughness number equivalent to the mean maximum height of the roughness profile, Rz as reported by [60] and [61].”
Experimental study of compressibility, roughness and rarefaction influences on microchannel flow (2007, background): “[18] experimentally studied hydraulic diameters of 325–1819 lm with Reynolds numbers ranging from 200 to 7200 for air and 200–5700 for deionized, degassed water.”
History, Advances, and Challenges in Liquid Flow and Flow Boiling Heat Transfer in Microchannels: A Critical Review (2012, methodology): “Finally, during the period 2005–2006, attention was focused on practical implementation, heat transfer enhancements using offset strip fins and nanofluids, developing an in-depth understanding of roughness effects and transition to turbulence, and influence of channel deformity [48–52].”
A Simple Algorithm to Relate Measured Surface Roughness to Equivalent Sand-grain Roughness (2012, background): “The work of Kandlikar et al. (2005) was partly motivated by the very large relative roughnesses (up to 14”
Numerical simulation of flow through microchannels with designed roughness (2006, background): “The obstructions of various geometries studied so far can act as surface roughness for microchannels (Kandlikar et al. 2005).”
Characterization of the effect of surface roughness and texture on fluid flow—past, present, and future (2006, background): “[11] considered the effect of flow constriction due to roughness elements and proposed that the constricted flow area be taken in the velocity calculations.”