Dynamic Loading of Rupture Disks with Detonation Waves.

Luker, J.A.; Leibson, Melvin J.

doi:10.1021/je60002a008

Cited by 6 publications

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“…The impact pressure, that is the pressure behind the reflected wave, is of particular practical interest as a possible criterion for the design of process equipment subject to detonation. Indeed, Luker and Leibson (17) have recently reported that the computed impact pressure for conditions under which a rupture disk just fails under detonation bears a constant ratio slightly greater than unity to the rated static bursting pressure of the disk.…”

Section: Theoretical Compositions Temperatures and Pressuresmentioning

confidence: 99%

Detonation characteristics of hydrogen‐oxygen mixtures

1960

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E X P E R I M E N T A L WORKThe experimental equipment for the measurement of detonation velocities consisted of six different detonation tubes, a mixing and charging system, an ignition system, and a timing system.The characteristics of the detonation tubes are given in Table 1. The five round, straight tubes (A, B, C, D, and E ) were used to determine the effect of tube diameter on detonation velocity. Tube F was a 10-in. coil for convenience in temperature control for the high-and low-temperature experiments. The effect of coiling was evaluated by comparison of the velocities measured in tubes F and B. Rectangular tube G was used only to obtain schlieren photographs. All seven tubes were closed at both ends.The velocity of the detonation wave was measured with ionization probes. The probes were made by drilling a no. 76 drill through a Teflon insert in a stainless steel sleeve. The probes were threaded into the detonation tubes and adjusted so that the tip was flush with the wall. Each probe was connected as a shorting switch in the grid of an 884-thyratron tube. The grid bias of the thyratron tube was adjusted almost to the firing point to obtain maximum sensitivity. When the ionized gases behind the detonation front reached a probe, the resistance between the probe electrode (the drill) and ground (the tube wall) fell, and the thyratron fired. One probe and thyratron started a timer, and another probe and thyratron stopped it. The time interval was indicated to the nearest microsecond. The distances between the probes and the distance from the ignitor to the first probe are given in Table 1. The probe locations on tube F were on the outside of the coil and were determined before coiling. The distance between the probes was corrected for thermal expansion and contraction of the tube in computing the detonation velocity at nonambient temperatures. This correction was about 0.1% at the extreme temperatures. The starting distance for all the tubes was greater than the distance A.1.Ch.E. Journal indicated by LafEtte (14) and Greene (9) as necessary to attain stable detonation in hydrogen-oxygen mixtures. The probes required replacement after 20 to 30 runs.The high-temperature runs were made with the coiled tube in an oven, and the low-temperature runs with the coiled tube immersed in 5 gal. of normal propanol in an insulated tank. Dry ice was added to the propanol to cool to 200°K. and liquid nitrogen to reach lower temperatures. As the result of vigorous stirring, the temperature variation within the bath was held within rrfr2"K.The detonation tube was evacuated and then filled with premixed oxygen and hydrogen through a mapifold and switch system that kept the ignition circuit open while the filling valve was open. In the low-temperature runs the tube was evacuated at room temperature before cooling to avoid condensation. In both the highand low-temperature runs the mixture was not ignited until the pressure indicated on a manometer had remained constant for at least 5 min. Analyses of the hydrogen and oxygen o...

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Section: Theoretical Compositions Temperatures and Pressuresmentioning

confidence: 99%

Detonation characteristics of hydrogen‐oxygen mixtures

1960

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Basic Safety Valves Principles

2024

Safety Valves in Oil and Gas Plants

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Detonation characteristics of hydrogen‐oxygen mixtures at high initial pressures

Gealer

Churchill

1960

AIChE Journal

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Detonation velocities of hydrogen-oxygen mixtures were measured for initial pressures from14.4 to 1,OOO Ib./sq. in. abs. and compositions from 40 to 80 mole % molecular hydrogen. Detonation and impact characteristics were computed for essentially the same range of conditions by the use of the elementary theory of detonation. Equilibrium compositions of hydrogen-oxygen mixtures a t pressures from 10 to 2,000 atm. and temperatures from 3,000 t o 5,OaO"K. were included in the computations and have been filed with the American Documentation Institute.The effect of nonideal thermodynamic properties on the computed detonation velocities was considered. tempt to separate k and a, obtaining

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Dynamic Loading of Rupture Disks with Detonation Waves.

Cited by 6 publications

References 1 publication

Detonation characteristics of hydrogen‐oxygen mixtures

Detonation characteristics of hydrogen‐oxygen mixtures

Basic Safety Valves Principles

Detonation characteristics of hydrogen‐oxygen mixtures at high initial pressures

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