Experimental Study of Isothermal Wake-Flow Characteristics of Various Flame-Holder Shapes

An investigation of the isothermal wake-flow characteristics of several flame-holder shapes was carried out in a 4- by 4-inch flow chamber. The effects of flame-holder-shape changes on the characteristics of the Karman vortices and thus on the recirculation zones to which experimenters have related the combustion process were obtained for several flame holders. The results may furnish a basis of correlation, of combustion efficiency and stability for similarly shaped flame holders in combustion studies. Values of the spacing ratio-(ratio of lateral spacing to longitudinal spacing of vortices] obtained for the various shapes approximated the theoretical value of 0.36 given by the Karman stability analysis. Variations in vortex strength of more than 200 percent and in frequency of more than 60 percent were accomplished by varying flame-holder shape. A maximum increase in the recirculation parameter of 56 percent over that for a conventional V-gutter was also obtained. Varying flameholder shape and size enables the designer to select many schedules of variations in vortex strength and frequency- not obtainable by changing size only and may make it possible to approach theoretical maximum vortex strength for any given frequency

Aegean Seals of the Late Bronze Age: Stylistic Groups, VI. Fourteenth Century Mainland and Later Fourteenth Century Cretan Workshops

The sixth in a series of articles attributing Aegean sealstones and finger rings of the Late Bronze Age to stylistic groups

Aegean Seals of the Late Bronze Age: Masters and Workshops, II. The First Generation Minoan Masters

The second in a series of articles attributing Aegean sealstones and finger rings of the Late Bronze to stylistic groups

Ten Unpublished Letters by John Addington Symonds at Duke University

This study presents 10 previously unpublished letters from John Addington Symonds to Edmund Gosse, dated 1889-1892. The letters discuss many aspects in the early history of modern homosexuality

Aegean Seals of the Late Bronze Age: Stylistic Groups, V. Minoan Groups Contemporary with LM IIIA1

The fifth in a series of articles attributing Aegean sealstones and finger rings of the Late Bronze Age to stylistic groups

"Aegean Seals of the Late Bronze Age: Stylistic Groups. VII. Concordance"

The seventh, and last, in a series of articles attributing Aegean sealstones and finger rings of the Late Bronze Age to stylistic groups

Interactions between Aegean Seals and Other Minoan-Mycenaean Art Forms

Minoan-Mycenaean sealstones and finger rings display a complex iconography and set of compositions. The artistic interplay between this art form and other forms, especially fresco painting, was close and in many cases it can be demonstrated how sealstones and finger rings influenced the other arts

Evidence for Planning the Parthenon Frieze

This published abstract of a talk given at the AIA annual meetings in 1991 focuses on the many repeated elements and even entire figures which implies standard templates for the creation of whole scenes

Paul Rehak 1954-2004

An obituary for Paul Rehak (1954-2004)