Update app.py

app.py

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+import streamlit as st
+import numpy as np
+
+def get_fluid_properties(fluid):
+    """Returns density (kg/m^3) and viscosity (Pa.s) of the fluid."""
+    properties = {
+        "Water": {"density": 1000, "viscosity": 0.001},
+        "Oil": {"density": 800, "viscosity": 0.05},
+        "Air": {"density": 1.2, "viscosity": 1.8e-5},
+    }
+    return properties.get(fluid, {"density": None, "viscosity": None})
+
+def calculate_reynolds_number(density, velocity, diameter, viscosity):
+    """Calculates the Reynolds number."""
+    return (density * velocity * diameter) / viscosity
+
+def calculate_pressure_drop(diameter, flow_rate, density, viscosity, length=1.0):
+    """Calculates pressure drop in a straight pipe."""
+    # Calculate velocity
+    area = np.pi * (diameter / 2) ** 2
+    velocity = flow_rate / area
+
+    # Reynolds number
+    reynolds = calculate_reynolds_number(density, velocity, diameter, viscosity)
+
+    # Friction factor
+    if reynolds < 2000:
+        # Laminar flow
+        friction_factor = 64 / reynolds
+    else:
+        # Turbulent flow (Blasius correlation)
+        friction_factor = 0.3164 / (reynolds ** 0.25)
+
+    # Pressure drop (Darcy-Weisbach equation)
+    pressure_drop = (friction_factor * length * density * velocity**2) / (2 * diameter)
+    return pressure_drop, reynolds
+
+# Streamlit App
+st.title("Pressure Drop Calculator for Straight Pipe")
+
+# Inputs
+diameter = st.number_input("Pipe Diameter (m)", min_value=0.01, max_value=10.0, value=0.1, step=0.01)
+flow_rate = st.number_input("Flow Rate (m^3/s)", min_value=0.0001, max_value=10.0, value=0.01, step=0.001)
+fluid = st.selectbox("Fluid Type", ["Water", "Oil", "Air"])
+pipe_length = st.number_input("Pipe Length (m)", min_value=0.1, max_value=1000.0, value=1.0, step=0.1)
+
+# Get fluid properties
+fluid_props = get_fluid_properties(fluid)
+if fluid_props["density"] and fluid_props["viscosity"]:
+    density = fluid_props["density"]
+    viscosity = fluid_props["viscosity"]
+
+    # Calculate pressure drop
+    pressure_drop, reynolds = calculate_pressure_drop(diameter, flow_rate, density, viscosity, pipe_length)
+
+    # Output results
+    st.write("## Results")
+    st.write(f"Reynolds Number: {reynolds:.2f}")
+    st.write(f"Pressure Drop: {pressure_drop:.2f} Pa")
+
+    # Flow type
+    if reynolds < 2000:
+        st.write("Flow Type: Laminar")
+    else:
+        st.write("Flow Type: Turbulent")
+else:
+    st.error("Invalid fluid selected or missing properties.")
+
+# Deployment note
+st.info("You can deploy this app on Hugging Face by packaging it as a repository with a `requirements.txt` file.")