What is the thermal conductivity of mineral oil?

0.1056 Wm−1
Here, keff is the effective thermal conductivity of the Al2O3/AlN nanofluids and the kf is the thermal conductivity of the pure mineral oil (0.1056 Wm−1K−1 at room temperature).

Is mineral oil a good thermal conductor?

The thermal conductivity of oil is very low, approximately 0.136 W-m/K. Most modern transformers no longer use mineral oil. They use Esterized vegetable oils, which are much more environmentally friendly; however, they have similar low thermal conductivity.

What is the heat capacity of mineral oil?

The specific heat of mineral oil (1.67 kJ/kg.

What is mineral oil transformer?

Transformer oil is a mineral based oil that is commonly used in transformers for its chemical properties and dielectric strength. This oil in your transformer acts as an insulator and a cooling agent. Over time, the oil will degrade resulting in the potential for faults and costly repairs.

How is thermal conductivity calculated?

K = (QL)/(AΔT)

1. K is the thermal conductivity in W/m.K.
2. Q is the amount of heat transferred through the material in Joules/second or Watts.
3. L is the distance between the two isothermal planes.
4. A is the area of the surface in square meters.
5. ΔT is the difference in temperature in Kelvin.

What fluid has the highest thermal conductivity?

Water is one of the best choices for liquid cooling applications due to its high heat capacity and thermal conductivity. It is also compatible with copper, which is one of the best heat transfer materials to use for your fluid path.

What is in mineral oil?

Most often, mineral oil is a liquid by-product of refining crude oil to make gasoline and other petroleum products. This type of mineral oil is a transparent, colorless oil, composed mainly of alkanes and cycloalkanes, related to petroleum jelly. It has a density of around 0.8–0.87 g/cm3 (0.029–0.031 lb/cu in).

What is the viscosity of mineral oil?

Table 1. Classification of mineral hydrocarbons

Name	ADI (mg/kg bw)a	Viscosity at 100 °C (mm2/s)
Mineral oil (medium and low viscosity)	0–0.01e	7.0–8.5
class II
N70(H)		7.7
Mineral oil (medium and low viscosity)	0–0.01e	3.0–7.0

What is the specific heat of oil?

Oil specific heat capacity heat is not a constant. It depends on the temperature and is usually in the range of 1.67-2.5 kJ/kg׺С.

Is oil more thermally conductive than water?

Oil has a lower specific heat than water. Oil can be heated to high temperatures with relatively smaller input of energy than water. At a fixed temperature, oil transfers heat more gradually to food than water at the same temperature. In liquid form, oil can be heated to a higher temperature than water.

Why do we use mineral oil in transformers?

Naphthenic mineral oil has long been the most preferred insulating liquid for power transformer insulation because it has a good pouring point at low temperatures, good thermal cooling capacity, low cost, high efficiency and availability on the transformers market [1, 2, 3, 7].

What is thermal conductivity measured in?

watts per meter-kelvin
Units. In the International System of Units (SI), thermal conductivity is measured in watts per meter-kelvin (W/(m⋅K)). Some papers report in watts per centimeter-kelvin (W/(cm⋅K)).

What is the thermal conductivity of the oil in a transformer?

The thermal conductivity of oil is very low, approximately 0.136 W-m/K. Most modern transformers no longer use mineral oil. They use Esterized vegetable oils, which are much more environmentally friendly; however, they have similar low thermal conductivity. The oil in transformers does not principally move heat by thermal conductivity.

How effective is minmineral oil as a transformer oil?

Mineral oil is generally effective as a transformer oil, but it has some disadvantages, one of which is its relatively low flashpoint versus some alternatives. If a transformer leaks mineral oil, it can potentially start a fire.

What kind of oil is used in electrical transformers?

Mineral oils have been used as electrical cooling oils for many years, in distribution and power transformers. (5) Chemically, mineral oils are a mixture of many different types oils. White Oils “White Oil” is a special type of mineral oil that’s undergone a refining process called “hydrotreating”.

What happens if a transformer leaks mineral oil?

If a transformer leaks mineral oil, it can easily start a fire. Fire codes often require that transformers inside buildings use a less flammable liquid, or the use of dry-type transformers with no liquid at all.

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