الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
The average rate of liquid-solid mass and heat transfer (by analogy) at the inner side of a serpentine tube heat exchanger/reactor was studied under turbulent flow conditions using the well-known copper dissolution technique. Variables studied were the solution flow rate, physical properties of the solution, inner tube diameter, U-bend curvature, and the effect of drag-reducing polymers. Dimensional analysis correlated the experimental data by the equation: 𝑆ℎ = 1.48 ∗ 𝑅𝑒0.56 ∗ 𝑆𝑐0.33 ∗ (𝑑𝑑𝑐)−0.1 For a given set of conditions, the above mass transfer correlation predicted higher mass transfer coefficients than those of straight tubes by a factor ranging from 4.12 to 5.36 depending on the operating conditions. The high ratio of the mass transfer coefficient to the pressure DROP for the serpentine tube over that for the straight tube qualifies the serpentine tube geometry to conduct diffusion-controlled reactions in an economically applicable manner. Drag-reducing polymer (Polyox WSR-301) was found to decrease the rate of diffusion-limited corrosion of the inner tube by a maximum of 23.3%. Possible applications of the serpentine tube as an efficient catalytic continuous reactor suitable for conducting liquid-solid diffusion-controlled reactions and membrane processes were highlighted. The possibility of using the present mass transfer equation in the design and scale-up of the serpentine tube heat exchanger in view of the analogy between heat and mass transfer and the prediction of the corrosion allowance of the serpentine tube heat exchanger wall in the design stage was pointed out.