Adduzione (fisica)

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L'adduzione è un processo di trasferimento di calore che si ha quando coesistono convezione e irraggiamento.

In molti casi e problemi, la trasmissione del calore per convezione e irraggiamento coesistono. In questi casi si è soliti parlare di trasmissione del calore per adduzione. La quantità di calore trasmessa nel tempo unitario può essere espressa dalla formula:

qS=hS(T1,T2)

dove h, il fattore di adduzione, è dato dalla somma della trasmittanza termica per convezione $h_{cv}$ e di quella per irraggiamento $h_{r}$ quando questi sono regolati dalle stesse temperature:

h=h_{cv}+h_{r}

È importante notare che, nonostante si parli di trasmissione del calore per adduzione, in realtà non si sta definendo un nuovo tipo di trasmissione ma si usa un termine che raggruppa due tipi di trasmissione differenti (convezione e irraggiamento) quando tali trasmissioni avvengono per $\Delta T$ limitate.

Bibliografia

(EN) Robert Byron, Warren E. Stewart; Edwin N. Lightfoot, Transport Phenomena, 2ª ed., New York, Wiley, 2005, ISBN 0-470-11539-4.
(EN) Frank P. Incropera, David P. DeWitt; Theodore L. Bergman; Adrienne S. Lavine, Fundamentals of Heat and Mass Transfer, 6ª ed., Wiley, 2006, ISBN 0-471-45728-0.

Voci correlate

V · D · M Scambio termico
Modalità	Conduzione · Convezione · Irraggiamento
Scambiatori di calore	Scambiatore a blocchi · Scambiatore a fascio tubiero e mantello · Scambiatore a pacco alettato · Scambiatore a piastre · Scambiatore a spirale · Scambiatore a doppio tubo · Apparecchiature incamiciate · Superfici immerse · Forno · Torre di raffreddamento · Scambiatore a fiamma sommersa · Scambiatore Ljungström · Ricuperatori Cowper · Pannelli solari · Saline marine · Evaporatore · Condensatore · Superficie alettata · Rigeneratore Frankl
Criogenia	Azoto liquido · Criochirurgia · Demagnetizzazione adiabatica · Economia ad azoto liquido · Refrigeratore a diluizione · Vaso di Dewar
Varie	Adduzione (fisica) · Coefficiente di scambio termico · Conducibilità termica · Diffusività termica · Equazione del calore · Radiazione termica · Resistenza termica · Termotecnica

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