An experimental investigation was conducted to establish the burnout limits of a polyphenyl mixture (15％ diphenyl, 58％ ortho-terphenyl, 2k^> meta-terphenyl, and 3％ para-terphenyl), diphenyl, Santowax R, and monoisopropyl-biphenyl for various pressures, fluids velocities, and fluid temperatures. The preheated liquid was passed, through an electrically heated, l/2-in.-OD tube (O.188-in. wall) with an unheated rod (0.188-in. dia) inserted concentric¬ally to form an annular passage, with an equivalent hydraulic diameter of 0.272 in. The electrical power input to the tube was increased by increments until the tube was damaged and/or the outside-wall temperatures rose rapidly to a high value (indicating film-boiling). A best-fit correlation was obtained for the critical heat flux of the polypheny1 mixture. An empirical equation was obtained for the critical heat flux, (Q/A) - of the 48 diphenyl tests.
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