@Article{hmt.11.4,
AUTHOR = {Ralph Eismann
, Robert Adams},
TITLE = {AN EXPLICIT AND CONTINUOUS FRICTION FACTOR CORRELATION FOR HELICAL TUBES WITH ARBITRARY ROUGHNESS},
JOURNAL = {Frontiers in Heat and Mass Transfer},
VOLUME = {11},
YEAR = {2018},
NUMBER = {1},
PAGES = {1--7},
URL = {http://www.techscience.com/fhmt/v11n1/53396},
ISSN = {2151-8629},
ABSTRACT = {Convergence of numerical schemes for pipe network analysis requires continuous modelling of pressure losses in the transition region between 
laminar and turbulent regions. Several existing correlations for the friction factor of straight pipes and helical tubes are presented. Based on these 
correlations a new explicit correlation for helical tubes with arbitrary surface roughness is derived. The friction factor is expressed as a continuous 
function of the Reynolds number covering laminar, transitional, and turbulent flow regions. Potential sources of error are also discussed, including 
the effects of tube deformation caused by the bending process.},
DOI = {10.5098/hmt.11.4}
}