首页|Numerical investigation on heat transfer and flow characteristics of supercritical methane in a horizontal tube
Numerical investigation on heat transfer and flow characteristics of supercritical methane in a horizontal tube
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NSTL
Elsevier
The main component of liquefied natural gas (LNG) is methane. The regasification process of LNG is usually under a supercritical condition. In this paper, a three-dimensional model is established to study the heat transfer and flow mechanism of supercritical methane in a heating process. The special physical properties of supercritical methane are compiled and imported through user-defined database. The standard k-epsilon model with the standard wall function is selected for simulation. The results show that deterioration of heat transfer occurs on the upper surface of the channel, which is most evident when the bulk temperature approaches the pseudocritical temperature. And the heat transfer coefficient increases first and then decreases along the channel with the bulk temperature rising. The peak value appears near the pseudocritical temperature. The pressure also has a great influence on heat transfer and flow. Besides, the buoyancy effect is strong near the pseudocritical point, leading to nonuniform distribution of temperature and density on the cross section, and causing significant radial circulation. The heat transfer deterioration can be effectively reduced by using special structures such as fins to hinder the buoyancy.
Supercritical methaneHeat transferHorizontal tubeBuoyancy effectHeat transfer enhancementCRYOGENIC METHANECHANNELSWATERMODELLNG
NSTL
Elsevier
