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Smooth film falling down horizontal tubes and the associated gas absorption were theoretically analyzed, assuming that a concentration boundary layer starts at the top of tube and develops along the smooth surface to its bottom. When the tube spacings are smaller than the capillary constant, liquid forms sheets between tubes and continuously flows in them, and forms nearly uniform films falling down all tubes. With wider tube spacings, liquid drips off each tube and causes the large-amplitude waves which rapidly spread on the film covering the lower tube. The drip makes the films flow more unevenly on lower tubes. The drip-caused waves enhance, the associated gas absorption by 50% or more, compared with the sheet flow between tubes. Imposing periodical perturbations on feeding flow to the top tube enhances the gas absorption of films with the sheet flow between tubes by \u301c20% at the Reynolds number Re\u003c30. Rayleigh instability was observed on films covering 6 mm diameter tubes and enhanced the gas absorption. The film flow on horizontal tubes, in which the drip completely renews concentration boundary layers and a new boundary layer starts at the top of lower tube, has larger gas absorption rate than the films falling down vertical tubes on which roll waves greatly enhance the gas absorption.", "subitem_description_type": "Other"}, {"subitem_description": "\u7814\u7a76\u5831\u544a\u66f8", "subitem_description_type": "Other"}]}, "item_1617186643794": {"attribute_name": "Publisher", "attribute_value_mlt": [{"subitem_1522300295150": "ja", "subitem_1522300316516": "\u91ce\u5e95\u6b66\u6d69"}]}, "item_1617186702042": {"attribute_name": "Language", "attribute_value_mlt": [{"subitem_1551255818386": "jpn"}]}, "item_1617186783814": {"attribute_name": "Identifier", "attribute_value_mlt": [{"subitem_identifier_type": "HDL", "subitem_identifier_uri": "http://hdl.handle.net/20.500.12000/11007"}]}, "item_1617186920753": {"attribute_name": "Source Identifier", "attribute_value_mlt": 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