Study of the thickness of the boundary layer of hydrocarbons in horizontal tubes of heat exchangers

The paper provides a brief overview of the methods for studying the boundary layer of Newtonian and non-Newtonian fluids.The authors of this work proposed to apply the approach of W.R. Schowalter and A. Acrivos to hydrocarbon liquids.To determine the thickness of the boundary viscous sublayer in the heated liquid in the tubes of heat exchangers, an equation system was used.The results of studying the thickness of the boundary layer of hydrocarbon raw materials in horizontal tubes of heat exchangers are obtained.The dependence curves of the thickness of the viscous sublayer of the raw material flow on its temperature and consumption in experimental and industrial heat exchangers are constructed.Calculations performed according to experimental data show that with an increase in the temperature of the heated raw material, the thickness of the viscous sublayer in the tube of the experimental heat exchanger decreases: when oil is heated -from 0.00844 to 0.00434 m, gas condensate -from 0.0033 to 0.00256 m and oil and gas condensate mixture -from 0.00422 to 0.00296 m.Under conditions of temperature increase (20100C) at different values of oil flow (0.52.5 l/min), the value of in the experimental heat exchanger tube decreases by 4.351 times.At the same time, an increase in oil temperature leads to a decrease in the value of by 2.24 times, and an increase in its consumption -by 1.94 times.The calculations showed that in the temperature range of 20100 C and oil flow rate of 63 m 3 /h, the limiting values of in the tubes of the 10E07 heat exchanger fluctuate within 0.003480.0018m.It is assumed that the total values V= 63 m 3 /h, t =75 C, Re = 1245 and = 0.00213 m characterize the rational mode of operation of this apparatus

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