Microwave power control strategies on the drying process I. Development and evaluation of new microwave drying system

Cheng, Wang-Yau; Raghavan, G.S.V.; Ngadi, Michael; Wang, N.

doi:10.1016/j.jfoodeng.2005.05.006

Cited by 43 publications

(23 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A calorimetric method has been adopted to evaluate the nominal MW power P 0 supplied to the sample/cavity ensemble [14,32].…”

Section: Calorimetric Methodsmentioning

confidence: 99%

“…Following a full-time exposure to MW, the water was briefly mixed and its temperature was read again, to determine P 0 [14]:…”

Section: Calorimetric Methodsmentioning

confidence: 99%

“…In the field of food treatment, different systems have been tried, and have been found nowadays in the consumer market to alleviate problems, such as the use of barriers, succeptors, intermittent rotation and alternative internal tray [8,9]. But due to their limited response in process performance, MW treatments are being more often proposed in combination with other heat transfer mechanisms, as with sole bulk convection: some authors focused on changes in quality parameters and in mechanical properties of different food substrates undergoing combined convective and MW drying [10][11][12][13], some others proposed to combine convection as a method to control MW power and heating [14,15] while some more [3,16,17] focused on theoretical and modeling approaches. Sole localized convection was then explored [8,9,18], while sole infrared [19,20], infrared and bulk convection [21], and a combination of radiant and localized forced convection [22,23] were implemented as well.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Characterization of a combination oven prototype: Effects of microwave exposure and enhanced convection to local temperature rise in a moist substrate

Pace¹,

Bonis²,

Marra

et al. 2011

International Communications in Heat and Mass Transfer

View full text Add to dashboard Cite

“…A calorimetric method has been adopted to evaluate the nominal MW power P 0 supplied to the sample/cavity ensemble [14,32].…”

Section: Calorimetric Methodsmentioning

confidence: 99%

“…Following a full-time exposure to MW, the water was briefly mixed and its temperature was read again, to determine P 0 [14]:…”

Section: Calorimetric Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Characterization of a combination oven prototype: Effects of microwave exposure and enhanced convection to local temperature rise in a moist substrate

Pace¹,

Bonis²,

Marra

et al. 2011

International Communications in Heat and Mass Transfer

View full text Add to dashboard Cite

“…Venkatesh and Raghavan (2004) further indicated that the heat energy of microwaves would be transferred directly by molecular motion, which would preclude certain uses of thermal process applications of microwaves. Likewise, Cheng et al (2005) discussed the potential for additional adverse effects such as physical damage to agricultural crops, abnormal temperature distribution, and impairment of biological functions. Velazquez et al (2005) studied the effects of microwave radiation on the germination inhibition of undesired seeds, Vidmar (2005) described a weed control machine, and Sartorato et al (2006) examined the potential of microwave energy as a weed control method.…”

Section: Introductionmentioning

confidence: 99%

Effects of Microwaves on the Germination of Weed Seeds

Şahin¹

2014

Journal of Biosystems Engineering

View full text Add to dashboard Cite

Purpose: Weeds cause significant losses in agricultural production. In this study, we investigated the effect of microwaves on the germination rates of cress and arugula seeds to determine whether microwaves could be developed as an effective alternative to conventional chemical-based herbicides. Methods: Seeds were planted at equal depths (8-10 mm) in a soil-turf mixture, and seeds were exposed to microwaves for 126 s, 70 s, and 50 s in a device constructed specifically for this study. A microwave tunnel was built using a variable speed conveyor belt and 4 magnetrons with a combined output power of 2.8 kW. Seeds that were not exposed to microwaves were germinated with regulated irrigation, temperature, and humidity controls in parallel with the treated seeds, and the germination rates were compared among the treatment groups. Results: We found that the exposure of cress and arugula seeds to microwaves for 126 s inhibited germination close to 100%. Cress seeds treated with microwaves for 50 s showed 95% germination compared to 65% germination of the untreated cress seeds. Conclusions: We predict that the thermal effect of microwave energy affects the germination ratio and germination rate of seeds.

show abstract

“…In the typical applications of microwave heating, a fixed microwave power is utilized throughout the entire microwave heating process without any control actions (Li et al, 2010a;Cheng et al, 2006). This strategy could lead to an unwanted phenomenon of thermal runaway resulted from hot spots on the product.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamics model based temperature tracking control in microwave heating

Yuan

Liang

Xiong

et al. 2016

JTST

View full text Add to dashboard Cite

Microwave heating technology has been widely used in both domestic and industrial applications. Temperature control technique is significant in improving the performance of microwave heating. A generalized numerical thermodynamics model associating with the temperature-dependent thermal and physical properties of material for the microwave heating process is proposed in this paper. Experimental data is applied to estimate the microwave power coefficients. Two controllers, sliding mode controller (SMC) and proportional-integral-differential (PID) controller, are presented as the easily implementable and efficient on-line controllers to track the desired temperature profile while acting on the microwave power and the heated material's temperature. The effectiveness of the proposed thermodynamics numerical model is verified by simulations and experiments, which shows that SMC controller has better dynamic control performance than PID controller.

show abstract

Microwave power control strategies on the drying process I. Development and evaluation of new microwave drying system

Cited by 43 publications

References 7 publications

Characterization of a combination oven prototype: Effects of microwave exposure and enhanced convection to local temperature rise in a moist substrate

Characterization of a combination oven prototype: Effects of microwave exposure and enhanced convection to local temperature rise in a moist substrate

Effects of Microwaves on the Germination of Weed Seeds

Thermodynamics model based temperature tracking control in microwave heating

Contact Info

Product

Resources

About