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Heat Pipe Maximum Capillary Pumping Heat Transport Limit Calculator

Heat pipes transport massive heat fluxes nearly isothermally using two-phase capillary fluid circulation.

Effective pore size of sintered powder or mesh

Working fluid surface tension (water ~ 0.06 N/m at 80°C)

Evaporator to condenser flow distance

Liquid working fluid dynamic viscosity

Fluid latent heat of phase change

Calculated Result
3714 Pa

Max Capillary Pumping Head

Capillary Limit Index

9763.3 W

Calculation Breakdown

  1. Young-Laplace Capillary LawΔPc_max = 2σ / rp => 3714 Pa

Capillary Head vs Pore Size

Interactive visualization based on your current inputs

ΔPc
0.02.2k4.3k6.5k8.7k15 µm35 µm70 µmPore Radius (µm)Head (Pa)

What Is the Heat Pipe Maximum Capillary Pumping Heat Transport Limit Calculator?

Heat pipes transport massive heat fluxes nearly isothermally using two-phase capillary fluid circulation.

The capillary limit is reached when viscous pressure drops in liquid and vapor exceed the maximum capillary pressure generated by the wick pores.

How Does the Heat Pipe Maximum Capillary Pumping Heat Transport Limit Calculator Work?

The calculation evaluates user-provided measurements using recognized domain equations, converts between measurement units, and adjusts for real-world efficiency factors.

Heat Pipe Maximum Capillary Pumping Heat Transport Limit Calculator Formula & Variables

The core mathematical equation utilized by this calculator is expressed as:

\Delta P_{c,\max} = \frac{2 \sigma}{r_p}, \quad \Delta P_c \ge \Delta P_l + \Delta P_v

Young-Laplace capillary head balance criterion.

How to Use the Heat Pipe Maximum Capillary Pumping Heat Transport Limit Calculator

  1. Enter your primary measurements in the input fields above.
  2. Select your preferred units (e.g. metric or imperial) if applicable.
  3. Review or adjust operational assumptions such as field efficiency.
  4. Click Calculate to instantly generate the full results breakdown and visual chart.
  5. Use the Reset button at any time to clear the form and test a new scenario.

Step-by-Step Example Calculation

Laptop Vapor Chamber Heat Pipe

Input Values:

wickPoreRadiusUm:25.0
liquidSurfaceTensionNPerM:0.060
heatPipeLengthM:0.18
liquidViscosityPaS:0.0003
latentHeatJPerKg:2.3e6

Understanding Your Result

Your calculated result represents the realistic operational capacity or baseline output under the specified conditions. Comparing theoretical and effective outputs reveals the direct impact of turns, overlap, and practical downtime.

Factors That Affect the Result

Field terrain, operator experience, equipment maintenance, overlap margin, and weather conditions can significantly influence real-world output.

When Should You Use This Calculator?

Use this calculator whenever you need quick, verified estimates for job planning, budgeting, equipment sizing, or project timelines.

Assumptions & Limitations

  • Smaller pore radii increase capillary pumping head but reduce wick permeability.

Frequently Asked Questions

Calculation Accuracy & Reference Note

This calculator implements verified, deterministic mathematical equations based on published standards. Results should be treated as professional engineering estimates; always verify critical operations with local equipment manuals and site inspections.

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