May 2009

Piping/Fluid Flow

Explicit friction factor correlations for turbulent fluid flow in noncircular ducts and polymeric fluids

New equation provides highly accurate estimates

Goudar, C. T., Bayer HealthCare; Sonnad, J. R., University of Oklahoma Health Sciences Center

The friction factor for flow of a Newtonian fluid in circular pipes is defined as:1      where f is the Moody friction factor,2 D the pipe diameter, L the pipe length,  the pressure drop,  the fluid density and  the fluid velocity. The friction factor in Eq. 1 is a function of the Reynolds number alone for smooth pipes and under laminar flow conditions (Re < 2,100), this relationship can be expressed as:     where Re is the Reynolds number. For turbulent fluid flow in smooth pipes, the Nikuradse-Prandtl-von Kármán (NPK) equation3–5 has been widely accepted as the standard approach for describing friction factor: &#

Log in to view this article.

Not Yet A Subscriber? Here are Your Options.

1) Start a FREE TRIAL SUBSCRIPTION and gain access to all articles in the current issue of Hydrocarbon Processing magazine.

2) SUBSCRIBE to Hydrocarbon Processing magazine in print or digital format and gain ACCESS to the current issue as well as to 3 articles from the HP archives per month. $409 for an annual subscription*.

3) Start a FULL ACCESS PLAN SUBSCRIPTION and regain ACCESS to this article, the current issue, all past issues in the HP Archive, the HP Process Handbooks, HP Market Data, and more. $1,995 for an annual subscription.  For information about group rates or multi-year terms, contact email Peter Ramsay or call +44 20 3409 2240*.

*Access will be granted the next business day.

Related Articles

From the Archive



{{ error }}
{{ comment.comment.Name }} • {{ comment.timeAgo }}
{{ comment.comment.Text }}