Resistance Coefficient (k):
.calculator-container {
font-family: sans-serif;
border: 1px solid #ccc;
padding: 20px;
border-radius: 8px;
max-width: 500px;
margin: 20px auto;
background-color: #f9f9f9;
}
.calculator-form {
margin-bottom: 20px;
}
.form-group {
margin-bottom: 15px;
}
.form-group label {
display: block;
margin-bottom: 5px;
font-weight: bold;
}
.form-group input {
width: calc(100% – 22px);
padding: 10px;
border: 1px solid #ccc;
border-radius: 4px;
}
.calculator-result {
background-color: #e9e9e9;
padding: 15px;
border-radius: 4px;
text-align: center;
}
.calculator-result h3 {
margin-top: 0;
color: #333;
}
.calculator-result p {
font-size: 1.2em;
color: #007bff;
font-weight: bold;
}
button {
background-color: #007bff;
color: white;
padding: 10px 15px;
border: none;
border-radius: 4px;
cursor: pointer;
font-size: 1em;
width: 100%;
}
button:hover {
background-color: #0056b3;
}
function calculateK() {
var flowVelocity = parseFloat(document.getElementById("flowVelocity").value);
var pipeDiameter = parseFloat(document.getElementById("pipeDiameter").value);
var density = parseFloat(document.getElementById("density").value);
var pressureDrop = parseFloat(document.getElementById("pressureDrop").value);
var kValueElement = document.getElementById("kValue");
if (isNaN(flowVelocity) || isNaN(pipeDiameter) || isNaN(density) || isNaN(pressureDrop)) {
kValueElement.textContent = "Please enter valid numbers for all fields.";
return;
}
if (flowVelocity <= 0 || pipeDiameter <= 0 || density <= 0 || pressureDrop <= 0) {
kValueElement.textContent = "All values must be positive.";
return;
}
// The Darcy-Weisbach equation relates pressure drop to friction factor (f) and head loss.
// k is often related to minor losses or a specific coefficient.
// A common approach to calculate k for certain components (like valves or bends)
// relates it to the pressure drop caused by that component.
// Here, we'll assume a simplified relationship where k is directly proportional to
// pressure drop, fluid density, and inversely proportional to dynamic pressure.
// This is a simplified model and real-world k-values are often derived from experiments
// or more complex formulas specific to the component.
// Dynamic Pressure = 0.5 * density * velocity^2
var dynamicPressure = 0.5 * density * Math.pow(flowVelocity, 2);
// Resistance Coefficient (k) = Pressure Drop / Dynamic Pressure
var k = pressureDrop / dynamicPressure;
kValueElement.textContent = k.toFixed(4); // Display k with 4 decimal places
}