Dynamic measurement of speed of sound in n-Heptane by ultrasonics during fuel injections

Measurement of the Speed of Sound in Near-Critical and Supercritical n-Heptane at Temperatures from (513.40 to 650.90) K and Pressures from (2.5 to 10.0) MPa

“…Distribution of our measurements and literature data for the speed of sound in n -heptane in the p and T planes: red ▷, Minnetti et al; red ◁, Hasanov et al; pink circle with ×, Daridon et al; blue ○, Muringer et al; teal circle with +, Boelhouwer et al; □, Zotov et al; red square with ×, Zotov et al; orange ☆ with ×, He et al; blue ⬡, Dzida et al; maroon ⬡ with +, Dzida et al; blue ▽ with ×, Dzida et al; red ●, the critical point by Tsonopoulos et al; blue ◆, this work; , vapor pressure calculated from the fundamental equation of state of Span and Wagner …”

“…According to the investigated p – T region in this work, only some of the literature data related to elevated pressures are summarized in Table . Minnetti et al developed a novel technique based on the pulse-echo ultrasound measuring the speed of sound in n -heptane at T = 300.05 K and pressure from (10.3 to 21.3) MPa . Hasanov employed the pulse method to measure the speed of sound in n -heptane at T = (293.15 to 523.15) K and pressures up to 60 MPa .…”

“…Minnetti et al developed a novel technique based on the pulse-echo ultrasound measuring the speed of sound in nheptane at T = 300.05 K and pressure from (10.3 to 21.3) MPa. 8 Hasanov employed the pulse method to measure the speed of sound in n-heptane at T = (293.15 to 523.15) K and pressures up to 60 MPa. 9 Daridon et al presented the ultrasonic velocity measurement of the speed of sound in nheptane between (1 and 150) MPa and between (293.15 and 373.15) K. 10 Muringer et al measured the sound velocity in nheptane up to 263 MPa and at temperatures from 185 to 310 K by the phase comparison pulse method.…”