December 6th, Boiler Foundation Question 112: (A certain score will be given to the top 50)
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True or False: The heat transfer efficiency of a tube bundle subjected to lateral flue gas flow is worse than that of a tube bundle subjected to longitudinal flue gas flow. () Thank you for your support. Correct answer: additional wealth gain of +5–8 points; incorrect answer: additional wealth gain of +1 point
The heat transfer efficiency of a gas-parallel scouring tube bundle is inferior to that of a gas-parallel scouring tube bundle. ( ) The surface heat transfer coefficient is high during lateral scouring. Because during longitudinal scouring the flow is equivalent to that of a swept flat plate, the thermal boundary layer is thicker; whereas during lateral scouring the thermal boundary layer is thin and vortices resulting from boundary layer separation occur, increasing fluid turbulence and thus enhancing heat transfer.
The heat transfer efficiency of a tube bundle subjected to lateral flue gas scouring is lower than that of a tube bundle subjected to longitudinal flue gas scouring. (Mistake)
The heat transfer efficiency of a tube bundle subjected to lateral flue gas scouring is lower than that of a tube bundle subjected to longitudinal flue gas scouring. ( X )
Error. The heat transfer coefficient is high during lateral scouring.
Error. -----------------------On the contrary
The heat transfer efficiency of a tube bundle subjected to lateral flue gas scouring is lower than that of a tube bundle subjected to longitudinal flue gas scouring. ( X )
Wrong: The heat transfer efficiency of a tube bundle subjected to lateral flue gas flow is worse than that of a tube bundle subjected to longitudinal flue gas flow. （）
The heat transfer efficiency of a tube bundle subjected to lateral flue gas scouring is lower than that of a tube bundle subjected to longitudinal flue gas scouring. ( Wrong )
True or False: The heat transfer efficiency of a tube bundle subjected to lateral flue gas flow is worse than that of a tube bundle subjected to longitudinal flue gas flow. (X)