What is electrical properties of agricultural materials?

What is electrical properties of agricultural materials?

On the macroscopic level, electric properties are exploited at the determination of agricultural products’ moisture content (seeds, grains, vegetables, cotton lint, etc.), at determination of seeds or grain deterioration, of seeds germination (see Electromagnetic Fields, Impact on Seed Germination and Plant Growth ).

What is the application of electrical property in agricultural processing?

Electrical properties are important in processing foods with pulsed electric fields, ohmic heating, induction heating, radio frequency, and microwave heating. These properties are also useful in the detection of processing conditions or the quality of foods (Barbosa-Canovas et al. 2006).

What are the factors that will affect the dielectric properties of food materials in your testing?

The dielectric studies of food materials are an important tool to identify the quality of food materials and to improve dielectric heating uniformity. Frequency, moisture content, phase change, storage time and temperature are main factors that influence the dielectric properties of food material.

Why dielectric properties are critical in determining the rates and uniformity of heating in microwave thawing?

The dielectric properties of foods are important in understanding and modeling their behavior in radio-frequency (RF) and microwave processing, heating, and cooking of food materials. They are important because they influence the absorption of energy from the high-frequency electric fields and the conversion to heat.

How is moisture content of materials and the dielectric properties correlated?

In general, dielectric properties of lossy materials are dependent on frequency, temperature, and composition of the material. At microwave frequencies, dielectric properties of moist materials are strongly affected by the amount of water in these materials because of the polar nature of the water molecules.

What are engineering properties of food?

Physical characteristics of different food grains, fruits and vegetables; Shape andsize, description of shape and size, volume and density, porosity, surface area.

What are the properties of dielectric materials and factors effecting on the dielectric materials?

Following are the dielectric properties that influence the food:

• Frequency of microwave or the radio frequencies.
• Amount of water present in food.
• Temperature.
• The density of the material.
• Composition and structure of the material.

What are the factors affecting dielectric strength?

Dielectric strength relies on many factors such as crystalline structure, imperfections and impurities found in the insulator material, number of electrons, and external factors such as the shape of the electrodes used to shed the electrical voltage, nature of the external surface and the test conditions which include …

What is dielectric property of a material?

Dielectric properties of materials are defined as a molecular property that is fundamental in all the materials that are capable of impending electron movement resulting in polarization within the material on exposure to an external electric field.

Which insulating material has high dielectric strength?

perfect vacuum
So what material has the highest Dielectric Strength? It might surprise you to know that a perfect vacuum is actually the best electrical insulator. A perfect vacuum has the highest dielectric strength, rated at 1×1012 MV/m.

Why do dielectric losses occur?

Dielectric loss is especially high around the relaxation or resonance frequencies of the polarisation mechanisms as the polarisation lags behind the applied field, causing an interaction between the field and the dielectric’s polarisation that results in heating. …

What is soil electrical conductivity (EC)?

Soil electrical conductivity, referred to as EC, is the ability of soil to conduct (transmit) or attenuate electrical current. EC is expressed in milliSiemens per meter (mS/m) or at times is reported in deciSiemens per meter (dS/m). Over the years, soil scientists have used EC to measure soil salinity.

What is the electrical conductivity of food?

The electrical conductivity (s/m) of liquid products measured at increasing temperatures. In addition to temperature, the electrical conductivity of foods is strongly affected by ionic content, moisture mobility, and physical structure, as well as the heating process.

How to measure the thermal conductivity of granular agricultural products?

Thermal conductivity and specific heat capacity of several types of granular agricultural products, namely of spring oat, wheat mixture Axis, barley mixture Expres, corn mixture and soybean Evans is measured in dependence on moisture content from the dry state to the water fully saturated state. An impulse technique is used for the measurement.

Can moisture conduct electricity in soil?

Moisture is the primary means to conduct electricity in the soil but other factors also exist and influence soil EC measurements. Some of these factors were outlined by Doerge et al. (1999) and are summarized below. Water content – Water contains ions that can conduct electricity.