K A I L Wijewardena Gamalath, N.S. Rajapakse, Thermodynamics of a Black Hole, ILCPA Volume 48, International Letters of Chemistry, Physics and Astronomy (Volume 48)
https://www.scipress.com/ILCPA.48.123
Abstract:
    A simple model was setup to find the mass variation over time for a Schwarzschild black hole. The temperature and entropy of a black hole was obtained from the numerically solved mass variation and the time variations of the black hole thermodynamic parameters were simulated. The mass of a given black hole reduces rapidly. The time taken for a black hole to vanish increases in an increasing rate with the given initial mass of the black hole. The temperature of a black hole drastically increases at the final stage of the black hole evaporation. The colour attributed to that temperature was found to be in the visible region for a significant amount of time. The black hole entropy also drastically reduces with its mass and through Hawking radiation it is added to the rest of the universe.
Keywords:
    Entropy, Hawking Radiation, Mass Variation, Schwarzschild Black Hole, Temperature, Thermodynamic Parameters