it is very informative video. Please let me ask a question. you showed a heat pipe modelling during the steady state case. However, can you please give any idea about temperature dependent thermal conducitivity or dynamics heat pipe modelling? how it can be modelled?
If we have a temperature difference of heat pipe less than 1K or greater than 5K then it will transport heat or not? if it does not transport heat then what is the reason behind it?
Hi! This is super helpful so thank you :) I was a little confused by 2K being considered a conservative estimate though, would you mind clarifying why that's the case?
1. If I dont have a heatsink but a fan instead, how do I estimate the length of my 'condensor'? 2. Is the Keff, calculated in the Advanced modelling approach for the envelope and the vapour, considered constant along the entire length of the heatpipe - including evaporator, adiabatic and condensor length?
1. You can use the entire length that would see airflow. If you don’t have any extended surfaces or fin volume, you are relying solely on the external surface of the heat pipe for thermal dissipation. In this scenario, you’ll likely have a large air side temperature rise; however the heat pipe should continue to operate with a similar delta T as described. 2. Yes
This was a great informative video. Thanks!, Learned a lot about heat pipes and also the video solved many questions that I had in my mind. Once again thnx!!
Should i use K=500 to 1200 W/mK or the calcluated K_eff value of 233,000 W/mK in simulation? Whenever I talk to heat pipe manufacturers they claim max thermal conductivity value of around 2000-2500 W/mK...Please help!!
The heat pipe will operate with a fairly consistent delta T. Therefore the effective conductivity will increase as length increases; hence a range. Also the 500 - 1200 W/m-K is a range for planar effective conductivity across the entire area of a HiK(TM) plate (not a heat pipe). The heat pipe will have a much higher axial thermal conductivity. The 233,000 W/m-K you reference is the suggested k effective for the vapor space in the lumped model approach. However, if you want a single effective thermal conductivity for a heat pipe that accounts for vapor space, conduction and envelope, our suggestion is to start with 10,000 W/m-K and adjust up or down until your delta T across the pipe is within a typical heat pipe operating range (2-5 C).
Hello sir. I want to do my phd in heat pipes and loop heat pipe with different fluids and different wicks .. is it good for future scope. Please help sir
Thanks for your question. It would be best if you would send your question with any details about your project through our website form at www.1-act.com/contact-us/. This will get you connected with the right people to answer your questions. Thanks again.
Very helpful vedio and website. Help me a lot to understand the heat pipe. Thanks.
it is very informative video.
Please let me ask a question.
you showed a heat pipe modelling during the steady state case. However, can you please give any idea about temperature dependent thermal conducitivity or dynamics heat pipe modelling? how it can be modelled?
If we have a temperature difference of heat pipe less than 1K or greater than 5K then it will transport heat or not?
if it does not transport heat then what is the reason behind it?
Noman- If you'd like to discuss your specific application send us an email and we will set up a call - solutions@1-act.com
Hi! This is super helpful so thank you :) I was a little confused by 2K being considered a conservative estimate though, would you mind clarifying why that's the case?
Hi, On the slide at 18mins, what is the equation you use to approximate the thermal resistances?
I recommend you use our heat pipe calculator tool, www.1-act.com/resources/tools/heat-pipe-calculator/
1. If I dont have a heatsink but a fan instead, how do I estimate the length of my 'condensor'?
2. Is the Keff, calculated in the Advanced modelling approach for the envelope and the vapour, considered constant along the entire length of the heatpipe - including evaporator, adiabatic and condensor length?
1. You can use the entire length that would see airflow. If you don’t have any extended surfaces or fin volume, you are relying solely on the external surface of the heat pipe for thermal dissipation. In this scenario, you’ll likely have a large air side temperature rise; however the heat pipe should continue to operate with a similar delta T as described.
2. Yes
This was a great informative video. Thanks!, Learned a lot about heat pipes and also the video solved many questions that I had in my mind. Once again thnx!!
Should i use K=500 to 1200 W/mK or the calcluated K_eff value of 233,000 W/mK in simulation?
Whenever I talk to heat pipe manufacturers they claim max thermal conductivity value of around 2000-2500 W/mK...Please help!!
The heat pipe will operate with a fairly consistent delta T. Therefore the effective conductivity will increase as length increases; hence a range. Also the 500 - 1200 W/m-K is a range for planar effective conductivity across the entire area of a HiK(TM) plate (not a heat pipe). The heat pipe will have a much higher axial thermal conductivity. The 233,000 W/m-K you reference is the suggested k effective for the vapor space in the lumped model approach. However, if you want a single effective thermal conductivity for a heat pipe that accounts for vapor space, conduction and envelope, our suggestion is to start with 10,000 W/m-K and adjust up or down until your delta T across the pipe is within a typical heat pipe operating range (2-5 C).
Greetings, Could you please make and post a video in your channel on step by step simulation procedure of a heat pipe using Fluent or Comsol. Thanks
Thank you for your suggestion! We will add this to a list of possible future videos!
Basically I am working on micro heat pipe for efficient electric component cooling this video was very helpful can I contact you guys anyway
Hi Mahender! Yes, if you go to www-1act.com and fill out our Contact Form with your question, we would be happy to help!
Hello sir. I want to do my phd in heat pipes and loop heat pipe with different fluids and different wicks .. is it good for future scope. Please help sir
Thanks for your question. It would be best if you would send your question with any details about your project through our website form at www.1-act.com/contact-us/. This will get you connected with the right people to answer your questions. Thanks again.
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