ASTM E598-08 Measuring Extreme Heat-Transfer Rates from High-Energy Environments

ASTM E598-08 Measuring Extreme Heat-Transfer Rates from High-Energy Environments

ASTM E598-08 test method determines the heat transfer properties of solids by using a calorimeter. The null point calorimeter used in this method is effective in determining the heat transfer rates of bodies immersed in different gaseous environments. The final results of this method are expressed in SI units.

    Scope:

    ASTM E598-08 test method covers the determination of heat transfer rates of solids. The heat flux is measured, and the changes in the heat transfer rates of solids are determined when placed in different gaseous environments. The results obtained help in the performance evaluation, quality control, and research. The applications can be specified, which creates ease for the customer and supplier to reach an agreement. Moreover, the effects of the surface chemical reactions, gradients in the local flow and energy fields, thermal radiation, and modal alignment can be determined. Signal conditioning and data processing can also be done. 

    Procedure:

    The null-point calorimeter is installed in the test environment, and a TFE-fluorocarbon cap protects the null-point sensor during insertion. This cap, later on, ablates, leading to damage in the sensor and the model. Therefore, it is preferred to sweep the test model rather than opting for the destruct mode of testing. This method allows for numerous calculations that keep in view the economic standards.    

    Specimen Size:

    Specimen size should be as per the requirements. In this case, the specimen is taken such that it can be detected by the null-point calorimeter of diameter 2.36mm.

    Data:

    The heat flux is calculated by applying the formula where ρ, Cp, k, and τ are density, specific heat, thermal conductivity, and a dummy variable of integration, respectively.

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