 review publish data rough transit laminar turbul flow review publish data rough transit laminar turbul flow review present publish data rough singl rough element transit laminar turbul flow attempt reanalyz correl reanalysi transit reynold number flat plate pressur gradient function ratio height rough element displac thick boundari layer element function relat better represent data constant critic reynold number rough element data effect rogh stream initi turbul plot ratio transit reynold number rough plate smooth plate ratio height rough element displac thick boundari layer element good correl data shape transit occur downstream rough element height-thick ratio depend stream speed locat rough element airstream turbul transit posit reach element remain height stream speed increas paper discuss data distribut rough transit flat plate well publish data rough effect transit air-foil 