Do you mean the "International Journal of Heat and Mass Transfer" or the journal "Heat and Mass Transfer"? I don't think either of them provides a Word template. I'd recommend preparing a plain MS Word file following the author guidelines (http://www.elsevier.com/journals/international-journal-of-heat-and-mass-transfer/0017-9310/guide-for-authors or http://www.springer.com/engineering/mechanical+engineering/journal/231#).