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Determining the freezing point of high-density hydrocarbon fuel by Hortvet method (CAT#: STEM-PPA-0157-LJX)

Introduction

High density hydrocarbon fuel is an important component of liquid propellant. From aircraft and missiles to rocket propulsion and satellite control, high-density hydrocarbon fuel has important application value. With the development of aerospace technology, the speed and range of aircraft have been greatly improved. In order to satisfy the good ignition performance and flow performance in high altitude low temperature environment, the fuel must not only have a higher volume calorific value, but also have a good low temperature performance.<br />The freezing point of fuel is the lowest temperature at which the fuel is free of hydrocarbon crystallization, which is an important index to characterize the low temperature performance of fuel. This is because hydrocarbon crystals that appear in the fuel when lowered to the freezing point block the fuel from passing through the vehicle's filters.




Principle

The current popular method for detecting the freezing point of milk is the Hortvet cryoscope. A beaded thermistor and a churn device are arranged in the sample tube of the detector. During the test, a small amount of milk sample is put into the sample tube and immediately placed in the cold trap. The temperature of the sample is measured by the thermistor. The sample is rapidly iced and slowly cooled until -3 ℃. A vibrating stirring rod sends energy pulses toward the wall of the sample test tube, forming ice crystals that create a "frozen pulse." As the supercooled milk sample freezes, the potential heat of melting is released, and the temperature of the sample rises to the freezing point plateau, after which the temperature continues to drop. The temperature of the platform is the freezing point of milk.

Applications

For determining the freezing point of liquid

Procedure

1. Put the sample into the test tube
2. Put the test tube into the cold trap
3. Stir and ice the sample quickly with slow cooling until -3 ℃
4. The sample forms ice crystals
5. Read the freezing temperature

Materials

• Sample Type:
High-density hydrocarbon fuel

Notes

The cold trap temperature can be automatically controlled at a constant temperature between -6.5 ℃ and -9.5 ℃.