An investigation of a multi-layered oscillating heat pipe additively manufactured from Ti-6Al-4V powder
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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.
International Journal of Heat and Mass Transfer
author list (cited authors)
Ibrahim, O. T., Monroe, J. G., Thompson, S. M., Shamsaei, N., Bilheux, H., Elwany, A., & Bian, L.
complete list of authors
Ibrahim, Omar T||Monroe, J Gabriel||Thompson, Scott M||Shamsaei, Nima||Bilheux, Hassina||Elwany, Alaa||Bian, Linkan