# Rectangular duct, roughened long base wall # # U1/Us # # X3/B= 0.8 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 # X2/B 0 .828 .912 .98 1.011 1.001 .976 .914 .819 .671 .08 .825 .913 .976 1.008 .999 .976 .913 .819 .674 .16 .824 .912 .976 1.01 .995 .976 .903 .819 .674 .24 .824 .913 .976 1.009 .994 .973 .904 .816 .671 .32 .824 .913 .977 1.009 .993 .969 .9 .815 .671 .4 .826 .916 .98 1.009 .994 .968 .894 .812 .67 .48 .828 .918 .982 1.01 .989 .965 .893 .809 .669 .56 .829 .92 .982 1.01 .988 .957 .887 .806 .668 .64 .83 .921 .983 1.01 .987 .952 .879 .795 .66 .72 .832 .926 .985 1.011 .982 .95 .874 .786 .65 .8 .834 .924 .988 1.008 .981 .94 .866 .772 .648 .88 .835 .925 .991 1.008 .977 .936 .857 .767 .637 .96 .837 .929 .992 1.007 .974 .927 .85 .759 .629 1.04 .839 .929 .99 1.004 .973 .925 .844 .75 .62 1.12 .841 .927 .988 1.002 .967 .917 .838 .745 .61 1.2 .842 .924 .98 .993 .962 .912 .831 .736 .605 1.28 .839 .917 .972 .984 .956 .905 .826 .729 .599 1.36 .835 .904 .954 .972 .948 .902 .825 .727 .593 1.44 .827 .887 .935 .954 .934 .895 .818 .725 .59 1.52 .812 .867 .913 .933 .917 .884 .817 .721 .588 1.6 .8 .842 .876 .899 .893 .862 .801 .722 .58 1.64 .788 .827 .862 .883 .876 .854 .794 .715 .578 1.68 .775 .814 .847 .867 .859 .841 .782 .705 .574 1.72 .762 .794 .832 .85 .839 .821 .771 .7 .575 1.76 .745 .775 .812 .828 .819 .801 .751 .687 .562 1.8 .722 .754 .791 .809 .797 .775 .729 .667 .551 1.82 .71 .742 .783 .796 .784 .757 .714 .655 .541 1.84 .697 .728 .768 .782 .769 .748 .702 .642 .527 1.86 .682 .716 .754 .765 .753 .734 .685 .626 .517 1.88 .666 .698 .737 .75 .737 .713 .673 .608 .508 1.9 .647 .691 .723 .735 .716 .701 .65 .586 .485 1.91 .634 .675 .711 .724 .707 .691 .64 .571 .474 1.92 .622 .663 .697 .714 .697 .677 .626 .565 .461 1.93 .604 .654 .69 .699 .68 .654 .609 .553 .447 1.94 .59 .636 .674 .68 .669 .643 .599 .529 .432 1.95 .575 .622 .655 .669 .649 .629 .581 .519 .411 1.96 .55 .592 .626 .643 .627 .6 .551 .497 .383 1.97 .508 .556 .594 .608 .599 .559 .518 .448 .34 1.98 .434 .492 .533 .561 .546 .475 .438 .374 .263 1.99 .382 .432 .456 .441 .452 .451 .317 .277 .206 # Us (m/sec) 16.96 17.15 17.11 17.23 17.32 17.32 17.33 17.24 17.23 # Ub (m/sec) 14.10 14.10 14.10 14.43 14.43 14.43 14.22 14.23 14.23