Influence of an array of wall-mounted cylinders on the mass transfer from a flat surface

An experimental study is performed to investigate the effects of two arrays (in-line and staggered) of cylinders on the mass transfer from a flat surface on which the cylinders are situated. Both arrays have seven rows of short (height-to-diameter ratio of unity) cylinders and identical transverse and longitudinal pitches. The naphthalene sublimation technique, in association with an automated computer controller naphthalene surface measurement system gives detailed local mass transfer information. Mass transfer from the region adjacent to the base of a cylinder in an array is comparable to that around an isolated cylinder. Area-averaged mass transfer results show that the arrays produce mass-transfer enhancement from the surface of approximately 46 and 53 percent for in-line and the staggered arrays, respectively.