Dimension Optimization for Silica Sand Based on the Analysis of Dynamic Absorption Efficiency in Microwave Drying

Abstract

We propose a theoretical guideline for prediction of maximum microwave absorption in microwave drying by optimizing the thickness of a silica sand layer based on analysis of reflection loss (RL). The microwave RL of the silica sand layer was studied over the moisture content of 1% to 5% at 20 C and the silica sand (5% moisture content) in the temperature range of 20 to 100 C at 2.45 GHz. The calculated RL for various moisture contents and temperatures shows that the RL sensitively depends on the thickness of the silica sand. There are absorption peaks in the RL patterns, and the microwave absorption peak shifts towards a smaller thickness side as the moisture content and temperature of the silica sand increase. We also show that the intensity of microwave absorption peaks in the RL patterns of silica sand decrease with decreasing moisture content, and achieve the highest absorption at 60 C.

Rapid synthesis of rutile TiO 2 powders using microwave heating

“…A C C E P T E D ACCEPTED MANUSCRIPT 4 scale operation, which is necessary for sustainable development [33][34][35][36][37][38][39][40][41].…”

Determination of Moisture Content in Synthetic Moulding Sand on the Grounds of Relative Permittivity Measurement

“…In many scientific works it has been shown that a value of permittivity depends, among the others, on microwave field frequency, qualitative and quantitative composition of the material, and especially on the content of water that is the main absorber of electromagnetic radiation [3][4][5][6][7][8][9][10][11]. Till now, the results presented in the matter literature have been related to quartz sand or soil that, like moulding sand, is a multiphase mixture.…”