*Storage of Natural Gas by CNTs DOI: http://dx.doi.org/10.5772/intechopen.103814*

simultaneously. Several equations are calculated and obtained, and other equations are collected from other sources. To answer the equations of adsorption and storage of natural gas in nanoparticles, the equations of adsorption isotherm, adsorption heat, kinetics, energy, and mass must be used. To obtain the mass and energy equations, it is first necessary to write the equilibrium equations and then, using the conditions and assumptions governing the problem, the final equation is obtained. Due to the small physical dimensions, especially the thickness, it is not necessary to solve the problem in all dimensions. After examining this issue with Comsol software, it was proved that considering multidimensional or one-dimensional problem does not cause a difference in the results obtained, which is another reason for not solving the problem in all dimensions. To solve the existing equations, a radial system was considered to study temperature changes along the radius and other volumetric and mass values were calculated. Because the pressure gradient in ANG storage tanks is less than 700 kPa, there is no need to solve the Navier-Stokes equation [1].
