Numerical simulation demonstrates heat transfer deterioration in supercritical commercial LNG pipe flows, suggesting pipe roughness optimization to minimize thermal risks.
Hydrocarbon impurities in Liquified Natural Gas can lead to unwanted occurrences like heat transfer deterioration and pseudo-boiling phenomena. It can pose a challenge for cooling channels in rocket engines. This study examines the impacts of hydrocarbon impurities on heat transfer deterioration in cooling channels. The Reynolds averaged Navier Stokes equation is solved numerically for different commercial LNG flows in circular pipes under supercritical conditions. The thermophysical and transport properties are calculated using the 2008-GERG equation of states and extended corresponding states models. The simulations reveal that hydrocarbon impurities significantly impact heat transfer deterioration. These impacts vary depending on the concentrations of hydrocarbons. A Nusselt number correlation equation is derived numerically, which describes the heat transfer deterioration of multiple LNGs. In addition, the effects of roughness heights to minimize heat transfer deterioration are studied in detail.
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Nasser et al. (2024) studied this question.
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