This paper investigates condensation process and liquid reaction on a moving square shape micro-object by lattice Boltzmann method. Micro-object with a horizontal velocity toward the left side of the domain is considered. Both condensation and evaporation processes are included in the simulations for three cases. For first case, it is assumed that there is no liquid on micro-object walls at initial time and appearance of liquid is only due to the condensation. For second, and third cases, a drop is considered initially on upper, and back walls of the micro-object, respectively. The effects of initial position of drop and velocity of micro-object on liquid reaction and condensation process are investigated. It is found that for all values of micro-object velocity, the difference between three cases for liquid reaction parameter will be negligible over time. Moreover, the liquid reaction grows faster for high values of micro-object velocity.

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