Heat-transfer coefficients are presented for water flowing vertically in thin rectangular channels (0.1 × 2.5 in.) 18 and 36 in. long and heated electrically around the entire periphery. The range of variables covered is: 65 to 200 psia pressure, 90 to 200 F sub-cooling, and 4 to 50 fps water velocity. Heat-transfer correlations are given for data along the narrow and wide faces of the rectangular test section. Burnout data also are reported with steam blanketing occurring first at the corner of the test section. The proposed correlating equation, valid at the narrow face of the test section, gives values considerably lower than those obtained in a circular pipe.

In this paper is discussed the application of some of the concepts of modern control theory to the problem of the governing of compression-ignition engines. A physical description of the problem is given, illustrated by measurements made on governors and engines, including some to show the effect of the finite-time intervals between successive firing strokes, and other non-linearities such as Coulomb friction. In Appendix I is discussed the setting up of the equations of motion of mechanical systems, and their solutions using vector methods and the inverse locus to find the stability and also the transient responses of the system. While none of the theory will be novel to control engineers, part of its presentation may be. Some experimental data obtained on medium-size engines are included, together with comments on their use and some details on the investigation of unstable engine-governor systems. A large saving in test-bed time is reported.

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