Design and operation of a microwave oven with rotating drums

Download

index.pdf

Date

2009

Author

Cilvez, Eda

Metadata

Show full item record

Item Usage Stats

198
views

86
downloads

In this study it was aimed to design and operate a new system with sufficient number of rotating drums since rotation of turntable is incapable of providing uniformity. Effect of new design on final color values and moisture content were also investigated. Macaroni beads were colored with CoCl2 solution and processed in a domestic microwave oven starting from 11.3±0.10% moisture content and L*= 41.1±0.31 , a*= 8.5±0.27 , b*= 5.3±0.22 color value with turntable and the proposed design. In experiments 40%, 60%, 80% and 100% power levels and 1, 2 and 3 min processing times and 2 different locations were used. The average color values measured were not affected significantly by the locations studied inside the cavity for both operation types. The changes in color values were found to be significant with altering power level for both operation types. Time also changed average color values for samples processed on turntable and in rotating drums. The new design lowered the average L* values of the final product and kept the sample from burning. Average a* and b* values were not significantly affected by the operation type. The uniformity of final product in terms of color distribution was affected significantly by the operation type and the improvement in uniformity calculated quantitatively by means of variances and found out that the new design improved the color uniformity of the final product by 94.7%. The non-uniformity of the products processed on turntable was significantly changed with power level. Time or location did not affect uniformity significantly for both operation types. The final average moisture contents of samples processed on turntable were lower than the ones processed with the new design. That is, the rotating drums lowered the moisture removal compared to the turntable.

Subject Keywords

Food engineering., Engineering design

URI

http://etd.lib.metu.edu.tr/upload/3/12610988/index.pdf
https://hdl.handle.net/11511/19057

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Grape juice filtration, thermopyhsical properties of clear fruit juices and pressurized low polarity water (plpw) extraction of polyphenolic compounds from grape canes Karacabey, Erkan; Bayındırlı, Levent; Department of Food Engineering (2009) In this study it was aimed to design and operate a new system with sufficient number of rotating drums since rotation of turntable is incapable of providing uniformity. Effect of new design on final color values and moisture content were also investigated. Macaroni beads were colored with CoCl2 solution and processed in a domestic microwave oven starting from 11.3±0.10% moisture content and L*= 41.1±0.31 , a*= 8.5±0.27 , b*= 5.3±0.22 color value with turntable and the proposed design. In experiments 40%, 60...
Design and implementation of a broadband I-Q vector modulator and a feedforward linearizer for V/UHF band Ünlü Özkaya, Ayşe; Demir, Şimşek; Department of Electrical and Electronics Engineering (2010) Considering the requirements of the commercial and military applications on amplitude and phase linearity, it is necessary to reduce nonlinearity of the amplifiers. There are several linearization techniques that are used to reduce nonlinearity effects. Feedforward linearization technique is known as one of the best linearization methods due to its superior linearization performance and broadband operation. Vector modulators which allows amplitude and phase modulation simultaneously, is the most important c...
DESIGN AND EVALUATION OF 2 BLOCK CODED MODULATION SCHEMES SAYRAC, B; YUCEL, MD (1994-04-14) Presents a study on the design and evaluation of two block coded modulation systems. One of the systems uses a binary construction and quadrature amplitude modulation. The other utilizes a ternary construction and phase modulation. The performance of the two coded schemes are compared theoretically with those of uncoded schemes of the same bandwidth, average power and transmission rate. The ternary scheme is also evaluated practically by computer simulations. Furthermore, the sub-optimum detection algorithm...
Modeling of plosive to vowel transitions Beköz, Alican; Demirekler, Mübeccel; Department of Electrical and Electronics Engineering (2007) This thesis presents a study concerning stop consonant to vowel transitions which are modeled making use of acoustic tube model. Characteristics of the stop consonant to vowel transitions are tried to be obtained first. Therefore several transitions including fricative to vowel transitions are examined based on spectral and time related properties. In addition to these studies, x-ray snapshots, lip videos and also experiments including subjects are used to intensify the characterization, from the production...
Design and Analysis of a Perfect Metamaterial Absorber for Sub-Terahertz Frequencies Sabah, Cumali; Wellmann, Thorsten; Voss, Daniel; Zouaghi, Wissem; Roskos, Hartmut G. (2015-08-27) A new near-perfect metamaterial absorber (MA) consisting of a square resonator with gaps and cross-wire strips is presented for the sub-terahertz frequency range. A narrow-band response of the proposed MA provides near-perfect absorption (absorbance of 99.23%) at 0.6 THz. In addition, numerical simulations show that the suggested MA could achieve very high absorption over a wide range of angles of incidence at least for transverse magnetic (TM) waves. As a result, the suggested model can be used for numerou...

Citation Formats

E. Cilvez, “Design and operation of a microwave oven with rotating drums,” M.S. - Master of Science, Middle East Technical University, 2009.