Example #1
0
        public Hyd_Rauheit hydraulische_Rauheit(ReynoldsZahl Re, double k, double d)
        {
            var temp = Math.Pow(Re.value, (double)7 / 8) * k / d;

            if (temp <= 5)
            {
                return(Hyd_Rauheit.glatt);
            }
            else if (temp <= 225)
            {
                return(Hyd_Rauheit.uebergang);
            }

            return(Hyd_Rauheit.rauh);
        }
Example #2
0
        public double calculate(ReynoldsZahl Re, double k, double d)
        {
            double value = 0;

            if (rohrstroemung(Re) == Rohrstroemung.laminar)
            {
                value = 64 / Re.value;
            }

            else             /*Rohrstroemung.turbulent*/
            {
                if (hydraulische_Rauheit(Re, k, d) == Hyd_Rauheit.glatt)
                {
                    if (Re.value > Math.Pow(10, 5))
                    {
                        value = calculate_Hermann(Re);
                        Console.WriteLine("calculated with Hermann" + value);
                    }
                    else
                    {
                        value = calculate_Blasius(Re);
                        Console.WriteLine("calculated with Blasius" + value);
                    }
                }
                else if (hydraulische_Rauheit(Re, k, d) == Hyd_Rauheit.uebergang)
                {
                    value = calculate_Pham(k, d, Re);
                    Console.WriteLine("calculated with Pham" + value);
                }
                else
                {
                    value = calculate_Nikuradse(k, d, Re);
                    Console.WriteLine("calculated with Niku" + value);
                }
            }
            return(value);
        }
Example #3
0
 private double calculate_Blasius(ReynoldsZahl Re)
 {
     return(0.3164 / Math.Pow(Re.value, (double)1 / 4));
 }
Example #4
0
 private double calculate_Hermann(ReynoldsZahl Re)
 {
     return(0.0032 + 0.221 * Math.Pow(Re.value, -0.237d));
 }
Example #5
0
 public Rohrstroemung rohrstroemung(ReynoldsZahl Re)
 {
     return(Re.value >= 2320 ? Rohrstroemung.turbulent : Rohrstroemung.laminar);
 }
Example #6
0
 private double calculate_Nikuradse(double k, double d, ReynoldsZahl Re)
 {
     return(Math.Pow(2 * Math.Log10(d / k) + 1.138, -2));
 }
Example #7
0
 private double calculate_Pham(double k, double d, ReynoldsZahl Re)
 {
     return(Math.Pow(-2d * Math.Log10(k / 3.7 / d - 4.52 / Re.value * Math.Log10(7 / Re.value + k / 7 / d)), (double)-2));
 }