The data for the thermal conductivity that is published ranges from ten thousand to one hundred thousand W/m.K. This figure is between 250 and 500 times solid copper or aluminum thermal conductivity.
These numbers are not reliable for most electronic applications. The conductivity of copper heat pipes varies greatly with the length of the heatpipes and to some degree with evaporator and condenser sizes, and the amount of transported power.
Heatpipes that are approximately 100 mm in length can achieve 10,000 W/m.K of thermal conductivity. A 200 mm length yields less than 33 percent of the 100,000 W/m.K thermal maximum that is typically published.
The calculation of the effective lengths of heatpipes is a function of the adiabatic condenser and evaporator lengths. The specified performance data for heatpipes is adequate for most standard applications but is limited for specific use.
The customization of heatpipes markedly affects performance and operational characteristics. Changing the internal structure of heatpipes, such as their wick thickness and porosity, allows tuning of heatpipes to meet specific performance features and operating parameters.
When the given heatpipe diameter needs to operate against gravity or at a higher power load, there needs to be an increase in the wick's capillary pressure. Higher power handling capacities require a larger pore radius.
To effectively work against gravity requires a smaller pore radius or increased wick thickness. Suppliers who specialize in the customization of heatpipes frequently use formulated copper powders or individual mandrels to meet the requirements of the product application.
Size is generally the most important factor with heatpipes. However, outward design changes such as bending or flattening degrade the performance of heatpipes. Gravity also has an influence. Copper heat pipes are capable of being flattened between 30 to 60 percent of their diameter.
The two significant performance limits for the application of heatpipes is the vapor limit and the wick limit. Flattening heatpipes alone does not degrade performance. Performance depends on the amount of excess vapor space available before heatpipes are flattened.
To know more about copper heat pipes and heatpipes visit to website.
These numbers are not reliable for most electronic applications. The conductivity of copper heat pipes varies greatly with the length of the heatpipes and to some degree with evaporator and condenser sizes, and the amount of transported power.
Heatpipes that are approximately 100 mm in length can achieve 10,000 W/m.K of thermal conductivity. A 200 mm length yields less than 33 percent of the 100,000 W/m.K thermal maximum that is typically published.
The calculation of the effective lengths of heatpipes is a function of the adiabatic condenser and evaporator lengths. The specified performance data for heatpipes is adequate for most standard applications but is limited for specific use.
The customization of heatpipes markedly affects performance and operational characteristics. Changing the internal structure of heatpipes, such as their wick thickness and porosity, allows tuning of heatpipes to meet specific performance features and operating parameters.
When the given heatpipe diameter needs to operate against gravity or at a higher power load, there needs to be an increase in the wick's capillary pressure. Higher power handling capacities require a larger pore radius.
To effectively work against gravity requires a smaller pore radius or increased wick thickness. Suppliers who specialize in the customization of heatpipes frequently use formulated copper powders or individual mandrels to meet the requirements of the product application.
Size is generally the most important factor with heatpipes. However, outward design changes such as bending or flattening degrade the performance of heatpipes. Gravity also has an influence. Copper heat pipes are capable of being flattened between 30 to 60 percent of their diameter.
The two significant performance limits for the application of heatpipes is the vapor limit and the wick limit. Flattening heatpipes alone does not degrade performance. Performance depends on the amount of excess vapor space available before heatpipes are flattened.
To know more about copper heat pipes and heatpipes visit to website.
