Optimizing electro-thermo Helds for soot oxidation using microwave heating and metal

Al-Wakeel, Haitham B.; Karim, Zainal Ambri Abdul; Al-Kayiem, Hussain H.

doi:10.1088/1757-899x/78/1/012018

Cited by 5 publications

(4 citation statements)

References 10 publications

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“…k: is constant value represents the power attenuation of microwave cavity called attenuator pad. Where, the microwave cavity is a closed surfaces system of a perfect electrical conductor works as a Faraday cage [42], which highly attenuates or reduces the microwave leakage to out of microwave oven.…”

Section: Fig 2 the Block Diagram Of Automatic Controlmentioning

confidence: 99%

An Overview on a Technique to Measure and Control of the Electromagnetic Radiation Inside a Microwave Oven

Thamer¹,

Al-Wakeel²,

MohammadRidha³

et al. 2021

IJCCCE

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The Microwave oven is a system used to convert the electromagnetic energy to thermal energy when the microwave cavity is loaded with a dielectric material. The ordinary microwave ovens are not supported with complex features for detecting parameters such as temperature, weight, and loaded material availability. Due to the lack of material availability, several laboratory and industrial applications require these features to switch off the oven. The reflections of electromagnetic radiation inside an empty microwave oven lead to oven damage. An overview of the microwave oven characteristics and emergence of electromagnetic radiation inside a microwave oven is presented in this study. The parameters measured inside the microwave oven, methods for power attenuation in a microwave oven, microwave power detector, and microwave oven leakage are discussed as well. Moreover in the methodology of this work, proposed a new technique based on the measurement of leaked microwave power to control the microwave oven. The preliminary results showed that the leakage measurement of electromagnetic power changes with the state/phase of the material inside the microwave oven, which ensured the possibility of the proposed promising technique. This work will be continued to connect the microwave oven with a spectrum analyzer and computer via hardware and software interfaces depending on the methodology of this article. A computer code will be developed to read the measured power and automatically switch off the microwave oven depending on materials state. Index Terms— Microwave, power, measurement, control.

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Section: Fig 2 the Block Diagram Of Automatic Controlmentioning

confidence: 99%

An Overview on a Technique to Measure and Control of the Electromagnetic Radiation Inside a Microwave Oven

Thamer¹,

Al-Wakeel²,

MohammadRidha³

et al. 2021

IJCCCE

View full text Add to dashboard Cite

show abstract

“…As a consequence, the complex dielectric permittivity had an initial value of 4.5−0.02935j . The dielectric permittivity was set as: 4.5 + T−T 0 800 − (0.02935 + T−T 0 1000 )j by referring to the dielectric properties of carbon [26,27]. Since the thermal conductivity of coke is 0.46-0.93 W/(m K) at the room temperature and 1.7-2.0 W/(m K) at 1000 °C [28], the thermal conductivity was also set as a first-class function as: 0.3 + T−T 0 700 [W/(m K)].…”

Section: The 3d Microwave Heating Model Featuring Idealized Mw-m Disc...mentioning

confidence: 99%

Numerical study on the role of microwave–metal discharge in microwave pyrolysis of WPCBs

Jiang

Sun

Wang

et al. 2021

Waste Dispos. Sustain. Energy

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As a promising green technology, microwave heating is highlighted by its high efficiency and low consumption, especially in the fast pyrolysis treatment for e-waste recycling. Electric discharge induced by microwave-metal interaction plays a significant role in the process, and its contribution to heat generation is, however, always hard to define qualitatively through direct experiments. In this simulation, a microwave heating model featuring the pulsed microwave-metal (MW-m) discharge was designed in multi-dimensions, using COMSOL Multiphysics software, to emphatically probe the depth and extent of the hot-spot effect as well as its auxo-action on the pyrolysis process of waste printed circuit boards (WPCBs). The energy loss generated by MW-m discharge was added into the models in the form of a built-in fluctuating heat source, and it is found that at a relatively low microwave energy-to-heat conversion rate (31.5%, 220.5 W), due to the unique thermal effect of microwave-metal discharge, it can achieve an ideal pyrolysis effect. Based on the results, the instantaneous heat by discharge is generated in the similar trend of radiation pulses, and the local temperature of discharge spots can reach more than 2000 K the instant the discharge occurs, shortening the overall pyrolysis from dozens of minutes to around 200 s.

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“…Spectral lines of microwave-metal discharge were predominantly found in visible region along with some peaks in ultraviolet region [3]. Despite limited understanding of MW-m discharge, its applications in organic chemistry [5][6][7], waste treatment [8][9], pollution control [10] and machining [11][12][13][14][15][16][17][18][19] of non-metallic materials are promising. MW-m discharge-induced plasma was first employed by Titto and coresearchers (2012) to drill glass and waste animal bone to prove feasibility of microwave drilling [12].…”

Section: Introductionmentioning

confidence: 99%

Effect of Drilling Conditions on Microwave-Metal Discharge during Microwave Drilling of Stainless Steel

Singh

Sharma

2019

AMM

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Processing of metallic materials using microwave energy offer benefits of time compression and energy saving during applications such as sintering, casting, melting, joining and cladding. However, use of microwave energy is uncommon for machining of metallic materials because of high reflectivity. The present work aims to study microwave-metal (MW-m) discharge-induced plasma channel (PC) characteristics during microwave drilling of thin stainless steel (SS) sheet (0.6 mm) at 2.45 GHz. Experimental trials inside two different microwave applicators A1 and A2 were monitored and recorded. The images of the plasma channel generated in both the microwave applicators were obtained at different time intervals to analyze the plasma channel diameter (PCD). Experimental results revealed that variation in the microwave power significantly affects the dimension of plasma channel generated in the tool-work gap and heat affected zone (HAZ) formed around the drilling zone. Reduction in microwave drilling time of approximately 80% was observed at 3 kW power compared to drilling time at 0.7 kW power. The HAZ observed in the samples drilled at 0.7 kW was significantly higher than the HAZ observed at 3 kW owing to higher drilling time of samples at 0.7 kW.

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Optimizing electro-thermo Helds for soot oxidation using microwave heating and metal

Cited by 5 publications

References 10 publications

An Overview on a Technique to Measure and Control of the Electromagnetic Radiation Inside a Microwave Oven

An Overview on a Technique to Measure and Control of the Electromagnetic Radiation Inside a Microwave Oven

Numerical study on the role of microwave–metal discharge in microwave pyrolysis of WPCBs

Effect of Drilling Conditions on Microwave-Metal Discharge during Microwave Drilling of Stainless Steel

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