An investigation of a multi-layered oscillating heat pipe additively manufactured from Ti-6Al-4V powder Academic Article uri icon

abstract

  • 2016 Elsevier Ltd A laser powder bed fusion (L-PBF) additive manufacturing (AM) method was employed for fabricating a multi-layered, Ti-6Al-4V oscillating heat pipe (ML-OHP). The 50.838.115.75mm3ML-OHP consisted of four inter-connected layers of circular mini-channels, as well an integrated, hermetic-grade fill port. A series of experiments were conducted to characterize the ML-OHP thermal performance by varying power input (up to 50W), working fluid (water, acetone, Novec 7200, and n-pentane), and operating orientation (vertical bottom-heating, horizontal, and vertical top-heating). The ML-OHP was found to operate effectively for all working fluids and orientations investigated, demonstrating that the OHP can function in a multi-layered form, and further indicating that one can stack multiple, interconnected OHPs within flat media for increased thermal management. The ML-OHP evaporator size was found to depend on the layer-wise heat penetration which subsequently depends on power input and the ML-OHP design and material selection. Using neutron radiography, electron scanning microscopy and surface metrology, the ML-OHP channel structure was characterized and found to possess sintered Ti-6Al-4V powder along its periphery. The sintered channel surface, although a byproduct of the L-PBF manufacturing process, was found to behave as a secondary wicking structure for enhanced capillary pumping and wall/fluid heat transfer within the OHP. With the newfound capabilities of AM, many high heat flux thermal management devices, specifically those that employ mini- or micro-channels, can be re-invented to possess embedded channels with atypical geometries, arrangements and surface conditions.

published proceedings

  • International Journal of Heat and Mass Transfer

altmetric score

  • 3

author list (cited authors)

  • Ibrahim, O. T., Monroe, J. G., Thompson, S. M., Shamsaei, N., Bilheux, H., Elwany, A., & Bian, L.

citation count

  • 37

complete list of authors

  • Ibrahim, Omar T||Monroe, J Gabriel||Thompson, Scott M||Shamsaei, Nima||Bilheux, Hassina||Elwany, Alaa||Bian, Linkan

publication date

  • May 2017