In the operation of the heat transfer service unit, one of the variables you can control is the rate of cooling water flowing against the cold side of the metal under study. if the temperature of the hot side of the metal is kept constant, what would be the expected effect of an increase in the rate of flow of cooling water against the cold side? 0 a. the rate of heat transfer through the material would increase. o b. the temperature gradient across the specimen would decrease. ° c. the rate of heat transfer through the material would decrease. ° c. the temperature at the hot side would increase.