def enthalpy_wall_del(T_0, T_w, C_p):
    """
    Calculates specific enthalpy difference between total conditions and
    those at the stagnation point of a sphere in supersonic flow.

    Input variables:
        T_0 :   Gas total temperature
        T_w :   Sphere wall temperature
        C_p :   Specific heat capacity
    """

    del_h = C_p * (T_0 - T_w)

    return del_h