Friction Factor Fluid flowing through pipes experiences resistance due to viscosity, turbulence and roughness of the pipe surface. The Darcy-Weisbach Equation (1) is commonly used for the analysis of steady-state, Newtonian-fluid flow inside pipes. It summarizes the relations between frictional…
This brief introduction to nanotechnology provides a basic understanding to those new to the field Most chemical engineers and chemists are aware of the recent excitement generated by nanotechnology, but many may wonder what all the fuss is about. Nanotechnology…
Here, a design approach for continuous stirred-tank reactors is outlined for both reversible and irreversible second-order reactions Multiple CSTRs (continuous stirred-tank reactors) are advantageous in situations where the reaction is slow; two immiscible liquids are present and require higher agitation…
Frequently, in chemical processing equipment it is possible to place the shaft support bearings in the chemical that is being processed. In some cases, this precludes the use of oil- or grease-lubricated bearings because the operating conditions are not conducive…
Lummus Technology, a CB&I company (The Woodlands, Tex.; www.cbi.com) and SYN Energy Technology Co. (Dalian, China; www.syn.ac.cn) have signed a global, cooperative market agreement to license a methanol-to-olefins (MTO) process. The technology, called DMTO, was developed by the Dalian…
Researchers at the Nanotube Research Center of the National Institute of Advanced Industrial Science and Technology (AIST; Tokyo; www.aist.go.jp) have developed a process for making organic nanotubes of metal complexes (photo, left). The scientists have produced organic nanotubes with metal…
When completed in early 2010, Shell Chemicals’ B.V. (The Hague, Netherlands; www.shell.com) 750,000-m.t./yr facility at the Shell Eastern Petrochemicals Complex in Singapore will be the world’s largest plant to produce mono-ethylene glycol (MEG) using Shell’s Omega process. This plant marks…
Researchers at the U.S. Dept. of Energy’s (DOE; Washington, D.C.) Ames Laboratory (www.ameslab.gov) and Iowa State University (both of Ames, Iowa) have developed a hard, smooth coating that can be applied to industrial equipment, such as pumps, gears and cutting…
Laminar Pipe Flow For steady flow in a pipe (whether laminar or turbulent), a momentum balance on the fluid gives the shear stress at any distance from the pipe centerline. In Equation (1), Φ = P + ρ gz. The…
Lubricant contamination in gearbox bearing housings can substantially reduce gear life. In critical applications, dual-face, magnetic bearing-protector seals will keep contamination out (Figure 1). Dual-face, magnetic bearing protectors are preferred in many difficult applications, such as wet cooling tower gearboxes,…