Theoretical and Experimental Studies of Heat Transfer and Pressure Drops Along Surfaces Fitted with Herringbone Fins. Correlation Between Geometric and Aerothermal Parameters; ETUDES THEORIQUE ET EXPERIMENTALE DU TRANSFERT DE CHALEUR ET DES PERTES DE CHARGE DE SURFACES MUNIES D'AILETTES DISPOSEES EN CHEVRON. CORRELATION ENTRE PARAMETRES GEOMETRIQUES ET AEROTHERMIQUES