Dose-effect relationships of bipolar radio frequency heating

作者：Chao Zhang, Ping Wang, Aifeng Liu, Juntao Zhang, Guangbin Yin, Zhefeng Jin, Yuandong Li, Shuo Yang · 发表于：Zhonghua wuli yixue zazhi · 年份：2018 · DOI：10.3760/cma.j.issn.0254-1424.2018.06.003 · 被引用次数：1 · 研究领域：Engineering Applied Research

Objective To study the effect of the preset temperature, heating time and the spacing of radio frequency electrodes. Methods Fresh egg white was used to study the effects of heater spacing, temperature and heating time. Two electrodes were fixed to keep the needles perpendicular to the center of egg white confined on a square plate. Temperatures from 50 to 90℃ were tested with heating times of 60 and 120 seconds and electrode spacings of 2.0, 1.0, 0.5 and 0.25 centimetres. The real-time temperature and the time to the appearance of a spindle-shaped bridge between the electrodes was observed. The egg white′s impedance and resistance, the lowest temperature of denaturation, and the mass (or volume) denatured at different time points were also observed. Results With an electrode spacing of 2 cm and the thermostat set at 63℃, the true electrode temperatures were 63.7 and 52.6℃, with the secondary electrode the cooler. Significant differences between the secondary electrode temperature and the preset temperature as well as the temperature between the primary and the secondary electrodes were observed. It was also found that different electrode spacing caused significant differences between the preset temperature and the primary as well as the secondary electrode temperature . Denaturation began at 56℃ with a spacing of 0.25 cm. At spacings of 0.25 and 0.50 cm, a spindle-shaped connection between the two electrodes was observed at temperatures above 70℃, but higher tem...