Calculating Nusselt No. for Natural Gas Pipeline

  • Thread starter Thread starter codicil
  • Start date Start date
  • Tags Tags
    Gas Natural
AI Thread Summary
To calculate the Nusselt number for natural gas in a buried pipeline, it's essential to determine the convective heat transfer coefficient, particularly for the fluid inside the pipe. The discussion highlights the need to establish whether the flow is fully developed or in the hydrodynamic entrance region, as this affects the assumptions made about the flow characteristics. The Reynolds Analogy is suggested as a potential method for estimating temperature distribution based on velocity distribution. Additionally, the conversation emphasizes the importance of having the appropriate differential equations or reference materials to guide the calculations. Accurate determination of these factors is crucial for effective thermal analysis in pipeline systems.
codicil
Messages
5
Reaction score
0
Hello I need to calculate the nusselt number for natural gas in a buried pipeline. My question is how to calculate the convective heat transfer co efficient?
The data is 220000m3/h, pipe ID 35", gas temperature 100C and ground temperature is 4C, gas SG 0.65, k = 0.037 W/m-K, R= 441 J/kg-K, CP = 2016 J/Kg-K, gama = 1.28
 
Engineering news on Phys.org
codicil said:
Hello I need to calculate the nusselt number for natural gas in a buried pipeline. My question is how to calculate the convective heat transfer co efficient?
The data is 220000m3/h, pipe ID 35", gas temperature 100C and ground temperature is 4C, gas SG 0.65, k = 0.037 W/m-K, R= 441 J/kg-K, CP = 2016 J/Kg-K, gama = 1.28

Do you mean the convective coefficient for the outside of the pipeline? Or are you trying to find a temperature distribution inside the pipe?
 
I am trying to find temperature distribution inside the pipe. I guess nusselt number associate with the flow of the liquid and it take convective heat transfer co-efficient within the fluid and not between wall and fluid, please correct me if I am wrong.
 
Nusselt number's general description: Dimensionless temperature gradient at the surface of a convection flow (not limited to internal flow).

There are several methods of dertermining or estimating the thermal distribution in a fluid traveling through a pipe of a different temperature. you will have to decide if the flow if fully developed or if you are within the hydrodynamic entrance region, and what sort of things you can assume about the flow such as incompressible, laminar/turbulent, constant pipe wall temperature, things like that.

One thing you might look into is the Momentum and Heat Transfer Analogy, a.k.a. the Reynolds Analogy. This analogy can give you an estimate of the fluid's temperature distribution based on its velocity distribution. Otherwise, The differential equation describing the heat flux in the fluid could get you to where you want to go.
 
well that is the problem I was not given any diffrential eq. all I was given is the above data
 
Is this a homework problem? Do you have a textbook of some kind that lays out such equations for you?
 

Thread 'HP Required to move a robot 10meters at 1.5m/sec'

I need some assistance with calculating hp requirements for moving a load. - The 4000lb load is resting on ball bearing rails so friction is effectively zero and will be covered by my added power contingencies. Load: 4000lbs Distance to travel: 10 meters. Time to Travel: 7.5 seconds Need to accelerate the load from a stop to a nominal speed then decelerate coming to a stop. My power delivery method will be a gearmotor driving a gear rack. - I suspect the pinion gear to be about 3-4in in...
View full post »

Thread 'Bubble formation in 4 mm gap vessel'

How did you find PF?: Via Google search Hi, I have a vessel I 3D printed to investigate single bubble rise. The vessel has a 4 mm gap separated by acrylic panels. This is essentially my viewing chamber where I can record the bubble motion. The vessel is open to atmosphere. The bubble generation mechanism is composed of a syringe pump and glass capillary tube (Internal Diameter of 0.45 mm). I connect a 1/4” air line hose from the syringe to the capillary The bubble is formed at the tip...
View full post »
Thread 'Calculate minimum RPM to self-balance a CMG on two legs'

Thread 'Calculate minimum RPM to self-balance a CMG on two legs'

Here is a photo of a rough drawing of my apparatus that I have built many times and works. I would like to have a formula to give me the RPM necessary for the gyroscope to balance itself on the two legs (screws). I asked Claude to give me a formula and it gave me the following: Let me calculate the required RPM foreffective stabilization. I'll use the principles of gyroscopicprecession and the moment of inertia. First, let's calculate the keyparameters: 1. Moment of inertia of...
View full post »

Similar threads

How to calculate Nusselt number
Replies
7
Views
36K
Determining Valve Size for Natural Gas: V250 Rotary Ball Valve Calculation
Replies
2
Views
2K
Open Gas Turbine - calculate T2, T3, T4, efficiency
Replies
1
Views
2K
As much steam as possible from engine exhaust gas + warm water?
Replies
25
Views
4K
Calculating entropy for an adiabatic system
Replies
11
Views
3K
Thermodynamics Problem - Adiabatic Reversible Process....
Replies
3
Views
3K
Condenser calculations - uncertainty
Replies
10
Views
3K
How Do You Calculate Gas Flow Rate in a Pipeline?
Replies
1
Views
4K
Are these gas density calculations correct?
Replies
2
Views
3K
How to Calculate Heat Loss in a Hot Water Pipe?
Replies
1
Views
2K

Hot Threads

Recent Insights

Back
Top