Mass Flux Density Converter — kg/(m²·s) Converter
Convert mass flux density between different units including kg/(m²·s), g/(cm²·s), lb/(ft²·s), and more. Essential for heat and mass transfer engineering, drying processes, and evaporation analysis. Mass flux density represents the mass flow rate per unit area perpendicular to the flow direction. See also our Molar Flow Rate Calculator and Flow Converter.
Value:
How to Convert Mass Flux Density
- Enter the mass flux density value in the input field above.
- Select the unit you're converting from in the "From" dropdown menu.
- Select the unit you want to convert to in the "To" dropdown menu.
- The result will automatically appear in the result field.
- Use the copy button to copy the result to your clipboard.
- Click any conversion in the list below to quickly select those units.
Mass Flux Density Formula
Mass Flux Density Definition:
G = ṁ/A
Where:
G = Mass flux density (kg/(m²·s))
ṁ = Mass flow rate (kg/s)
A = Cross-sectional area (m²)
Unit Conversion Formula:
G₂ = G₁ × (conversion_factor₁ / conversion_factor₂)
Common Units:
SI Unit: kg/(m²·s)
Time variants: kg/(m²·h), kg/(m²·min)
CGS: g/(cm²·s)
Imperial: lb/(ft²·s), lb/(ft²·h)
Unit Relationships:
1 kg/(m²·s) = 3600 kg/(m²·h) = 60 kg/(m²·min)
1 g/(cm²·s) = 10 kg/(m²·s)
1 lb/(ft²·s) = 4.88243 kg/(m²·s)
1 ton/(m²·h) = 0.2778 kg/(m²·s)
Heat Transfer Relationship:
q = G × cp × ΔT
Where: q = heat flux, cp = specific heat
Mass Transfer:
N_A = k_c × (C_As - C_A∞)
G_evap = k_m × (ρ_s - ρ_∞)Example Conversion
Problem: Convert 2.5 kg/(m²·s) to g/(cm²·s) and lb/(ft²·h).
Given: G = 2.5 kg/(m²·s)
Solution:
• To g/(cm²·s): 2.5 kg/(m²·s) / 10 = 0.25 g/(cm²·s)
• To lb/(ft²·h): 2.5 kg/(m²·s) / (4.88243/3600) = 1842.12 lb/(ft²·h)
Answer: 2.5 kg/(m²·s) = 0.25 g/(cm²·s) = 1842.12 lb/(ft²·h)
Technical Details
Mass flux density (also called mass flux or mass velocity) is a measure of the mass flow rate per unit area perpendicular to the flow direction. It is fundamental in heat and mass transfer engineering, where it determines convective heat transfer coefficients and mass transfer rates. In drying processes, mass flux density quantifies the rate of moisture removal from surfaces, critical for food processing, paper manufacturing, and pharmaceutical production.
In evaporation and condensation systems, mass flux density governs the design of heat exchangers, cooling towers, and distillation equipment. The concept is also essential in aerodynamics for calculating drag forces and in combustion engineering for determining burning rates. Industrial applications range from spray drying (0.01–1 kg/(m²·s)) to rocket nozzles (100–10000 kg/(m²·s)), spanning many orders of magnitude depending on the process intensity.
Mass Flux Density Reference Table
| Application | Typical Range | Description |
|---|---|---|
| Spray drying | 0.01–1 kg/(m²·s) | Food and pharmaceutical drying |
| Cooling towers | 0.5–3 kg/(m²·s) | Water evaporation for cooling |
| Heat exchangers | 10–500 kg/(m²·s) | Tube-side and shell-side flows |
| Boiling systems | 100–2000 kg/(m²·s) | Nucleate and film boiling |
| Condensation | 5–100 kg/(m²·s) | Film and dropwise condensation |
| Fluidized beds | 0.1–5 kg/(m²·s) | Gas-solid fluidization |
| Rocket nozzles | 100–10000 kg/(m²·s) | Propellant exhaust flow |
| Membrane filtration | 0.001–0.1 kg/(m²·s) | Reverse osmosis and ultrafiltration |
Frequently Asked Questions
What is mass flux density?
Mass flux density is the mass flow rate per unit area perpendicular to the flow direction. It is measured in kg/(m²·s) and represents how much mass passes through a given surface area per unit time. It is fundamental in heat transfer, mass transfer, and fluid dynamics engineering.
How is mass flux density used in drying processes?
In drying, mass flux density quantifies the rate of moisture removal from a surface. It depends on the driving force (humidity difference), mass transfer coefficient, and surface conditions. Engineers use it to design dryers, determine drying times, and optimize energy consumption.
What is the difference between mass flux and mass flow rate?
Mass flow rate (kg/s) is the total mass passing a point per unit time, while mass flux density (kg/(m²·s)) is mass flow rate divided by the cross-sectional area. Mass flux density is area-independent, making it useful for comparing different systems regardless of size.
Why is mass flux density important in heat exchangers?
Mass flux density directly affects the convective heat transfer coefficient. Higher mass flux increases turbulence and heat transfer rates but also increases pressure drop. Engineers optimize mass flux to balance heat transfer performance against pumping costs.
How do you convert between SI and imperial mass flux units?
To convert from lb/(ft²·s) to kg/(m²·s), multiply by 4.88243. This factor accounts for both the mass conversion (lb to kg) and the area conversion (ft² to m²). For hourly rates, additionally divide or multiply by 3600.
Objective of Measurement:
Measurement is the most important aspect of our life. We use measurement in science, engineering, business trading, personal life, education, and more other fields. As technology is growing day by day so we need a highly accurate and easy convenient global measuring system in each and every field. It is essential to use standard measurement in every field that everyone to be sure that they not get cheated.
History of Measurement:
In history for measurement people used the human body as a tool. For measuring length used forearm, hand, foot & finger as a unit. The foot, finger is a subdivided shorter unit of a length. This type of measurement is not accurate cause different in size of the arm & finger for different people & some of the countries still using it. In history, there were lots of measuring systems developed but mostly used imperial, the metric system of measurement. We use these systems for measure distances, volume, weight, speed, area etc. Due to this a major problem everyone is facing while doing trading between the countries. A huge improvement in civilization, It necessary to improve measuring standards. Nowadays International Standard (SI) units are used as a global measurement system.
Mass Flux Density Conversion - Unit Converter:
Our mass flux density conversion converter convert kg/(m²·s), kg/(m²·h), g/(m²·s), g/(cm²·s), kg/(m²·min), lb/(ft²·s), lb/(ft²·h), g/(m²·h), mg/(m²·s), ton/(m²·h) vice versa with metric conversion.
Mass flux density conversions & it's abbreviations
| Unit | Abbreviation | Unit | Abbreviation |
|---|---|---|---|
| kg/(m²·s) | kg/(m²·s) | kg/(m²·h) | kg/(m²·h) |
| g/(m²·s) | g/(m²·s) | g/(cm²·s) | g/(cm²·s) |
| kg/(m²·min) | kg/(m²·min) | lb/(ft²·s) | lb/(ft²·s) |
| lb/(ft²·h) | lb/(ft²·h) | g/(m²·h) | g/(m²·h) |
| mg/(m²·s) | mg/(m²·s) | ton/(m²·h) | ton/(m²·h) |
Complete list of Mass flux density conversion units and its conversion.
1 kg/(m²·s) = 3600 kg/(m²·h)
1 kg/(m²·s) = 1000 g/(m²·s)
1 g/(cm²·s) = 10 kg/(m²·s)
1 lb/(ft²·s) = 4.88243 kg/(m²·s)
1 kg/(m²·s) = 60 kg/(m²·min)
1 kg/(m²·s) = 1000000 mg/(m²·s)
1 ton/(m²·h) = 0.2778 kg/(m²·s)
1 kg/(m²·s) = 3600000 g/(m²·h)
1 lb/(ft²·h) = 0.001356 kg/(m²·s)