Near-field effect of the microwaves power applicators investigated for liquid processing applications

Surducan, Vasile; Neamţu, C.; Tudoran, Cristian

doi:10.1109/aqtr.2010.5520760

Cited by 4 publications

(5 citation statements)

References 8 publications

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“…The temperature inside the layers is measured by three medical grade thermistors (5) [11], using an analog resistor -to voltage Fig. 3 Our custom designed applicator and it's real temperature profile in physiological serum [10]. A small asymmetry in the temperature profile (created by the annular slot non-homogeneity) is clearly visible.…”

Section: Methodsmentioning

confidence: 99%

“…The microwave radiation at the applicator output is controlled in a closed loop (based on a proportionalderivative algorithm stored in the microcontroller firmware) by the temperature measured with an IR sensor (3a). We used a proprietary design for the applicator with an active aperture diameter of 50 mm [10]. The applicator's structure and the microwave intensity profile in the proximity of the applicator's aperture (cross section) is presented in figure 3.…”

Section: Methodsmentioning

confidence: 99%

“…The phantom (4) is manufactured in the laboratory using 10 mm thick plexiglas for the external walls (4a) and 0.1 mm Our custom designed applicator and its real temperature profile in physiological serum [10]. A small asymmetry in the temperature profile (created by the annular slot non-homogeneity) is clearly visible.…”

Section: Methodsmentioning

confidence: 99%

“…Figure 3.Our custom designed applicator and its real temperature profile in physiological serum[10]. A small asymmetry in the temperature profile (created by the annular slot non-homogeneity) is clearly visible.…”

mentioning

confidence: 99%

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Low cost method for temperature measurements on a multilayer system heated by microwave power field

Surducan¹,

Dădârlat²

2013

Meas. Sci. Technol.

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Microwave radiation is widely used for heating tissues in hyperthermia or diathermy medical treatments. Usually, in such treatments, the tissue's temperature is used as feedback for the microwave generator power control and consequently, for the control of the whole heating process. The temperature can be measured by contact, or non-contact (IR or MW radiometry), techniques. Unfortunately, in both cases the temperature sensors are also heated by the microwave power field, altering the measured result and sometimes damaging the sensors and the electronics. Another disadvantage of the IR temperature measurement is the possibility of measuring only skin temperature, independently on the penetration depth of the thermal wave. In this paper we present an experimental method for tuning the microwave generator power and the irradiation sequence, necessary to generate the correct temperature inside the layered system, by measuring only the surface temperature. An experimental three layer phantom model, with immersed temperature sensors has been used. It was demonstrated that the microwave power at the generator output can be adjusted by analyzing the differences between the layers' temperatures (measured by a contact technique) and surface's temperatures of the phantom (measured by IR method).

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

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Low cost method for temperature measurements on a multilayer system heated by microwave power field

Surducan¹,

Dădârlat²

2013

Meas. Sci. Technol.

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“…To overcome the limitations of previous studies, we propose an original mode of internal heating produced by microwave (MW) absorption. Microwave heating (MWH) potentially provides a very efficient way of producing non-contact, localised or extended heat sources by a convenient choice of microwave antenna, excitation sequence and selective absorption of fluids [12,13]. Here we present the first experimental results obtained using a specifically designed MW prototype.…”

Section: Introductionmentioning

confidence: 99%

Microwave-based laboratory experiments for internally-heated mantle convection

Limare

Surducan

Neamţu

et al. 2013

AIP Conference Proceedings

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The thermal evolution of terrestrial planets is mainly controlled by the amount of radioactive heat sources in their mantle, and by the geometry and efficiency of solid state thermo-chemical convection within. So far, these systems have been studied using numerical methods only and cross validation by laboratory analogous experiments has not been conducted yet. To fill this gap we perform the first laboratory experiments of mantle convection driven by microwave-generated internal heating. We use a 30x30x5 cm 3 experimental tank filled with 0.5 % Natrosol in water mixture (viscosity 0.6 Pa.s at 20 • C). The fluid is heated from within by a microwave device that delivers a uniform volumetric heating from 10 to 70 kW/m 3 ; the upper boundary of the fluid is kept at constant temperature, whereas the lower boundary is adiabatic. The velocity field is determined with particle image velocimetry and the temperature field is measured using thermochromic liquid crystals which enable us to charaterize the geometry of the convective regime as well as its bulk thermal evolution. Numerical simulations, conducted using Stag-3D in 3D cartesian geometry, reproduce the experimental setup (i.e., boundary conditions, box aspect ratio, temperature dependence of physical parameters, internal heating rate). The successful comparison between the experimental and numerical results validates our approach of modelling internal heating using microwaves.

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