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Induction Mass Heating
Published in Valery Rudnev, Don Loveless, Raymond L. Cook, Handbook of Induction Heating, 2017
Valery Rudnev, Don Loveless, Raymond L. Cook
A longitudinal flux inductor can be described as a solenoid induction heater (Figure 6.74) similar to that used in the IH of slabs. Traditionally, these heaters have high ηel and reduced sensitivity to strip-to-coil positioning and provide sufficient heat uniformity across the strip width. As in the case of IH of slabs, high coil electrical efficiency will be obtained if the ratio of strip thickness d to penetration depth δ is 2.5 or greater. The optimal value of the frequency that corresponds to the maximum coil efficiency can be estimated by using Equations 6.10 and 6.11.
A feasibility study of real-time monitoring techniques for scale deposition thickness in pneumatic conveying pipelines
Published in Particulate Science and Technology, 2018
Ingrid B. Haugland, Jana Chladek, Maths Halstensen
The heat pulse monitoring technique has several advantages. It is a so-called non-invasive technique, in which the measuring equipment can be attached to the pipe exterior. Using such methods is beneficial for monitoring of conveying systems where scale is deposited as the scaling may block in-line sensors. In addition, in-line equipment is likely to affect the flow patterns and properties in the system and could thereby increase the scale formation rates. The temperature sensors and induction coil can be easily attached by a “clamp-on” method to the test pipe exterior. Also, the induction heater provides quick, controlled and repeatable heating pulses. However, the scale layer thickness predictions resulting from the heat pulse method can be seen as “point-estimations” only, as the measurements are mainly affected by the deposition layer in the area close to where the sensors are mounted. Thus, the success of using this method in industrial applications is dependent on correct placement of the measuring equipment in an area where scale will form. Furthermore, as for all calibration methods, the technique requires reliable reference measurements to build the calibration model.
Development of a High Heat Flux Electric Joule Heating System for Testing a One-Side Heated Cooling Channel
Published in Fusion Science and Technology, 2022
Donkoan Hwang, Minkyu Park, Hoongyo Oh, Ji Hwan Lim, Moo Hwan Kim, Kil-Byoung Chai, HangJin Jo
1. An induction heater can be used to heat a metallic object through electromagnetic induction. The heater in this case consists of an electromagnet and an electronic oscillator through which the high-frequency current flows. The eddy currents are conducted through the metallic objects, thus generating heat.